Quantitative geotechnical characterization of seismic strengthening effect on siliceous soils
This dissertation investigates the phenomenon of “seismic strengthening”, which can be relevant to submarine landslide studies in active continental margins. Given that seismic strengthening is complex in nature and highly variable in different types of mixed sediments in the marine realm, this diss...
Ausführliche Beschreibung
Autor*in: |
Wu, Ting-Wei [verfasserIn] Kopf, Achim [akademischer betreuerIn] Camerlenghi, Angelo [akademischer betreuerIn] |
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Körperschaften: |
Universität Bremen [Grad-verleihende Institution] |
Hochschulschrift: |
Dissertation ; Universität Bremen ; 2021 |
Format: |
E-Book |
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Sprache: |
Englisch |
Erschienen: |
Bremen: 2021 |
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Schlagwörter: | |
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Formangabe: |
Hochschulschrift |
Umfang: |
1 Online-Ressource (187 Seiten) ; Illustrationen |
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Weitere Ausgabe: |
Erscheint auch als Druck-Ausgabe Wu, Ting-Wei: Quantitative geotechnical characterization of seismic strengthening effect on siliceous soils - Bremen, 2021 |
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Links: |
Link aufrufen |
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DOI / URN: |
urn:nbn:de:gbv:46-elib51007 10.26092/elib/897 |
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Katalog-ID: |
1765965292 |
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520 | |a This dissertation investigates the phenomenon of “seismic strengthening”, which can be relevant to submarine landslide studies in active continental margins. Given that seismic strengthening is complex in nature and highly variable in different types of mixed sediments in the marine realm, this dissertation focuses on two types of siliceous soils only: natural diatomaceous mud offshore Japan, and a silica sand standard from the USA for generic laboratory testing. These materials underwent multi-methodological geotechnical testing, and the results are presented in three manuscripts in collaboration with partner institutions in Norway, France and Austria. The first manuscript of this study presents a comprehensive analysis of the sedimentology and geotechnical properties of four recently acquired sediment cores (5 meters long) on the continental slopes adjacent to the Japan Trench and Nankai Trough. We observe unexpectedly high undrained shear strength and apparent overconsolidation in the Japan Trench slope cores. We propose that this is due to the presence of diatoms (~ 15% dry weight), which amplifies the strength gains via seismic strengthening due to high particle interlocking and surface roughness of the diatom frustules, especially after they are crushed and compacted by earthquakes. This is supported by comparison to samples from the Nankai Trough slope where diatoms are less abundant, and the shear strength follows the expected trend for active margin sediments. Following the observation of seismic strengthening from Japan, we developed dynamic testing procedures to simulate the effect of seismic shaking in the laboratory. In the second manuscript, we conduct undrained cyclic triaxial tests on Ottawa Sand under a mean effective stress of 100 kPa (~ 10 m depth). After the loading, we drain the excess pore pressure and measure the monotonic undrained shear strength. The cyclic loading and excess pore pressure drainage are used to simulate the effect of small to moderate seismic events on sand deposits. The result shows that the first cyclic loading and pore pressure drainage (first seismic event) can increase the sediment’s undrained shear strength by around 30% without much change in relative density (DR). We also observe that as the intensity of the shaking increases, the undrained shear strength increases. However, the undrained shear strength of a sample subjected to multiple seismic events does not show a clear trend to increase. The third manuscript focuses on the the effect of prior seismic events on the cyclic shear strength of Ottawa Sand. The results show that when cyclic loads only induce partial liquefaction (i.e. no failure) and subsequent drainage allows excess pore pressure to fully dissipate, there is a significant increase in the cyclic strength with negligible change of relative density. One seismic event (15 cycles of cyclic shear stress ratio ~ 0.147 and drainage) can increase the cyclic shear strength of an initially DR ~ 25% specimen to be stronger than an initially DR ~ 50% specimen. The results also show that as the intensity of the cyclic loading increases, the increase in the cyclic shear strength increases. However, in the case when cyclic loads lead to full liquefaction and subsequent drainage is allowed, although overall densification is observed, cyclic shear strength can either increase or decrease depending on the permanent deformation of the preceding undrained cyclic loading phase. The cyclic shear strength increases when the previous permanent (compressive) axial strain is less than 1%, and decreases when the permanent axial strain is 5%. | ||
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urn:nbn:de:gbv:46-elib51007 urn 10.26092/elib/897 doi (DE-627)1765965292 (DE-599)KXP1765965292 (OCoLC)1263179637 DE-627 ger DE-627 rda eng XA-DE-HB 551.468 DE-101 550 DE-101 Wu, Ting-Wei verfasserin (orcid)0000-0002-9587-0222 aut Quantitative geotechnical characterization of seismic strengthening effect on siliceous soils submitted by/vorgelegt von Ting-Wei Wu Bremen 2021 1 Online-Ressource (187 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2021 This dissertation investigates the phenomenon of “seismic strengthening”, which can be relevant to submarine landslide studies in active continental margins. Given that seismic strengthening is complex in nature and highly variable in different types of mixed sediments in the marine realm, this dissertation focuses on two types of siliceous soils only: natural diatomaceous mud offshore Japan, and a silica sand standard from the USA for generic laboratory testing. These materials underwent multi-methodological geotechnical testing, and the results are presented in three manuscripts in collaboration with partner institutions in Norway, France and Austria. The first manuscript of this study presents a comprehensive analysis of the sedimentology and geotechnical properties of four recently acquired sediment cores (5 meters long) on the continental slopes adjacent to the Japan Trench and Nankai Trough. We observe unexpectedly high undrained shear strength and apparent overconsolidation in the Japan Trench slope cores. We propose that this is due to the presence of diatoms (~ 15% dry weight), which amplifies the strength gains via seismic strengthening due to high particle interlocking and surface roughness of the diatom frustules, especially after they are crushed and compacted by earthquakes. This is supported by comparison to samples from the Nankai Trough slope where diatoms are less abundant, and the shear strength follows the expected trend for active margin sediments. Following the observation of seismic strengthening from Japan, we developed dynamic testing procedures to simulate the effect of seismic shaking in the laboratory. In the second manuscript, we conduct undrained cyclic triaxial tests on Ottawa Sand under a mean effective stress of 100 kPa (~ 10 m depth). After the loading, we drain the excess pore pressure and measure the monotonic undrained shear strength. The cyclic loading and excess pore pressure drainage are used to simulate the effect of small to moderate seismic events on sand deposits. The result shows that the first cyclic loading and pore pressure drainage (first seismic event) can increase the sediment’s undrained shear strength by around 30% without much change in relative density (DR). We also observe that as the intensity of the shaking increases, the undrained shear strength increases. However, the undrained shear strength of a sample subjected to multiple seismic events does not show a clear trend to increase. The third manuscript focuses on the the effect of prior seismic events on the cyclic shear strength of Ottawa Sand. The results show that when cyclic loads only induce partial liquefaction (i.e. no failure) and subsequent drainage allows excess pore pressure to fully dissipate, there is a significant increase in the cyclic strength with negligible change of relative density. One seismic event (15 cycles of cyclic shear stress ratio ~ 0.147 and drainage) can increase the cyclic shear strength of an initially DR ~ 25% specimen to be stronger than an initially DR ~ 50% specimen. The results also show that as the intensity of the cyclic loading increases, the increase in the cyclic shear strength increases. However, in the case when cyclic loads lead to full liquefaction and subsequent drainage is allowed, although overall densification is observed, cyclic shear strength can either increase or decrease depending on the permanent deformation of the preceding undrained cyclic loading phase. The cyclic shear strength increases when the previous permanent (compressive) axial strain is less than 1%, and decreases when the permanent axial strain is 5%. Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 seismic strengthening diatomaceous mud Ottawa Sand shear strength earthquake resistance liquefaction consolidation triaxial test Japan Trench Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Kopf, Achim akademischer betreuerin dgs Camerlenghi, Angelo akademischer betreuerin dgs Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Wu, Ting-Wei Quantitative geotechnical characterization of seismic strengthening effect on siliceous soils Bremen, 2021 187 Seiten (DE-627)1765965519 http://dx.doi.org/10.26092/elib/897 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 Resolving-System kostenfrei https://d-nb.info/1338946188/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/5100 Verlag kostenfrei GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER DSpace BO 20 01 0084 4593075475 x 12-10-24 21 01 0046 3963746394 ebook_2021_dissbremen Kostenloser Zugriff zza 09-08-21 22 01 0018 4593178894 SUBolrd xu 12-10-24 23 01 0830 4593228190 olr-d x 12-10-24 30 01 0104 4593274974 z 12-10-24 40 01 0007 4593308682 xsn 12-10-24 60 01 0705 4593366054 OLRD z 12-10-24 63 01 3401 4593422191 ORD x 12-10-24 70 01 0089 4593472032 z 12-10-24 105 01 0841 4593864100 z 12-10-24 110 01 3110 4593576563 x 12-10-24 132 01 0959 4593620406 OLR-DISS x 12-10-24 151 01 0546 4593664314 OLR-ODISS z 12-10-24 161 01 0960 4593687071 ORD z 12-10-24 293 01 3293 4593814421 ORD z 12-10-24 370 01 4370 4593853451 x 12-10-24 2403 01 DE-LFER 3984082762 00 --%%-- --%%-- n --%%-- l01 04-10-21 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 21 01 0046 https://doi.org/10.26092/elib/897 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 2403 01 DE-LFER http://dx.doi.org/10.26092/elib/897 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2021_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2024-10-12 10:31:16 |
spelling |
urn:nbn:de:gbv:46-elib51007 urn 10.26092/elib/897 doi (DE-627)1765965292 (DE-599)KXP1765965292 (OCoLC)1263179637 DE-627 ger DE-627 rda eng XA-DE-HB 551.468 DE-101 550 DE-101 Wu, Ting-Wei verfasserin (orcid)0000-0002-9587-0222 aut Quantitative geotechnical characterization of seismic strengthening effect on siliceous soils submitted by/vorgelegt von Ting-Wei Wu Bremen 2021 1 Online-Ressource (187 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2021 This dissertation investigates the phenomenon of “seismic strengthening”, which can be relevant to submarine landslide studies in active continental margins. Given that seismic strengthening is complex in nature and highly variable in different types of mixed sediments in the marine realm, this dissertation focuses on two types of siliceous soils only: natural diatomaceous mud offshore Japan, and a silica sand standard from the USA for generic laboratory testing. These materials underwent multi-methodological geotechnical testing, and the results are presented in three manuscripts in collaboration with partner institutions in Norway, France and Austria. The first manuscript of this study presents a comprehensive analysis of the sedimentology and geotechnical properties of four recently acquired sediment cores (5 meters long) on the continental slopes adjacent to the Japan Trench and Nankai Trough. We observe unexpectedly high undrained shear strength and apparent overconsolidation in the Japan Trench slope cores. We propose that this is due to the presence of diatoms (~ 15% dry weight), which amplifies the strength gains via seismic strengthening due to high particle interlocking and surface roughness of the diatom frustules, especially after they are crushed and compacted by earthquakes. This is supported by comparison to samples from the Nankai Trough slope where diatoms are less abundant, and the shear strength follows the expected trend for active margin sediments. Following the observation of seismic strengthening from Japan, we developed dynamic testing procedures to simulate the effect of seismic shaking in the laboratory. In the second manuscript, we conduct undrained cyclic triaxial tests on Ottawa Sand under a mean effective stress of 100 kPa (~ 10 m depth). After the loading, we drain the excess pore pressure and measure the monotonic undrained shear strength. The cyclic loading and excess pore pressure drainage are used to simulate the effect of small to moderate seismic events on sand deposits. The result shows that the first cyclic loading and pore pressure drainage (first seismic event) can increase the sediment’s undrained shear strength by around 30% without much change in relative density (DR). We also observe that as the intensity of the shaking increases, the undrained shear strength increases. However, the undrained shear strength of a sample subjected to multiple seismic events does not show a clear trend to increase. The third manuscript focuses on the the effect of prior seismic events on the cyclic shear strength of Ottawa Sand. The results show that when cyclic loads only induce partial liquefaction (i.e. no failure) and subsequent drainage allows excess pore pressure to fully dissipate, there is a significant increase in the cyclic strength with negligible change of relative density. One seismic event (15 cycles of cyclic shear stress ratio ~ 0.147 and drainage) can increase the cyclic shear strength of an initially DR ~ 25% specimen to be stronger than an initially DR ~ 50% specimen. The results also show that as the intensity of the cyclic loading increases, the increase in the cyclic shear strength increases. However, in the case when cyclic loads lead to full liquefaction and subsequent drainage is allowed, although overall densification is observed, cyclic shear strength can either increase or decrease depending on the permanent deformation of the preceding undrained cyclic loading phase. The cyclic shear strength increases when the previous permanent (compressive) axial strain is less than 1%, and decreases when the permanent axial strain is 5%. Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 seismic strengthening diatomaceous mud Ottawa Sand shear strength earthquake resistance liquefaction consolidation triaxial test Japan Trench Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Kopf, Achim akademischer betreuerin dgs Camerlenghi, Angelo akademischer betreuerin dgs Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Wu, Ting-Wei Quantitative geotechnical characterization of seismic strengthening effect on siliceous soils Bremen, 2021 187 Seiten (DE-627)1765965519 http://dx.doi.org/10.26092/elib/897 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 Resolving-System kostenfrei https://d-nb.info/1338946188/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/5100 Verlag kostenfrei GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER DSpace BO 20 01 0084 4593075475 x 12-10-24 21 01 0046 3963746394 ebook_2021_dissbremen Kostenloser Zugriff zza 09-08-21 22 01 0018 4593178894 SUBolrd xu 12-10-24 23 01 0830 4593228190 olr-d x 12-10-24 30 01 0104 4593274974 z 12-10-24 40 01 0007 4593308682 xsn 12-10-24 60 01 0705 4593366054 OLRD z 12-10-24 63 01 3401 4593422191 ORD x 12-10-24 70 01 0089 4593472032 z 12-10-24 105 01 0841 4593864100 z 12-10-24 110 01 3110 4593576563 x 12-10-24 132 01 0959 4593620406 OLR-DISS x 12-10-24 151 01 0546 4593664314 OLR-ODISS z 12-10-24 161 01 0960 4593687071 ORD z 12-10-24 293 01 3293 4593814421 ORD z 12-10-24 370 01 4370 4593853451 x 12-10-24 2403 01 DE-LFER 3984082762 00 --%%-- --%%-- n --%%-- l01 04-10-21 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 21 01 0046 https://doi.org/10.26092/elib/897 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 2403 01 DE-LFER http://dx.doi.org/10.26092/elib/897 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2021_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2024-10-12 10:31:16 |
allfields_unstemmed |
urn:nbn:de:gbv:46-elib51007 urn 10.26092/elib/897 doi (DE-627)1765965292 (DE-599)KXP1765965292 (OCoLC)1263179637 DE-627 ger DE-627 rda eng XA-DE-HB 551.468 DE-101 550 DE-101 Wu, Ting-Wei verfasserin (orcid)0000-0002-9587-0222 aut Quantitative geotechnical characterization of seismic strengthening effect on siliceous soils submitted by/vorgelegt von Ting-Wei Wu Bremen 2021 1 Online-Ressource (187 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2021 This dissertation investigates the phenomenon of “seismic strengthening”, which can be relevant to submarine landslide studies in active continental margins. Given that seismic strengthening is complex in nature and highly variable in different types of mixed sediments in the marine realm, this dissertation focuses on two types of siliceous soils only: natural diatomaceous mud offshore Japan, and a silica sand standard from the USA for generic laboratory testing. These materials underwent multi-methodological geotechnical testing, and the results are presented in three manuscripts in collaboration with partner institutions in Norway, France and Austria. The first manuscript of this study presents a comprehensive analysis of the sedimentology and geotechnical properties of four recently acquired sediment cores (5 meters long) on the continental slopes adjacent to the Japan Trench and Nankai Trough. We observe unexpectedly high undrained shear strength and apparent overconsolidation in the Japan Trench slope cores. We propose that this is due to the presence of diatoms (~ 15% dry weight), which amplifies the strength gains via seismic strengthening due to high particle interlocking and surface roughness of the diatom frustules, especially after they are crushed and compacted by earthquakes. This is supported by comparison to samples from the Nankai Trough slope where diatoms are less abundant, and the shear strength follows the expected trend for active margin sediments. Following the observation of seismic strengthening from Japan, we developed dynamic testing procedures to simulate the effect of seismic shaking in the laboratory. In the second manuscript, we conduct undrained cyclic triaxial tests on Ottawa Sand under a mean effective stress of 100 kPa (~ 10 m depth). After the loading, we drain the excess pore pressure and measure the monotonic undrained shear strength. The cyclic loading and excess pore pressure drainage are used to simulate the effect of small to moderate seismic events on sand deposits. The result shows that the first cyclic loading and pore pressure drainage (first seismic event) can increase the sediment’s undrained shear strength by around 30% without much change in relative density (DR). We also observe that as the intensity of the shaking increases, the undrained shear strength increases. However, the undrained shear strength of a sample subjected to multiple seismic events does not show a clear trend to increase. The third manuscript focuses on the the effect of prior seismic events on the cyclic shear strength of Ottawa Sand. The results show that when cyclic loads only induce partial liquefaction (i.e. no failure) and subsequent drainage allows excess pore pressure to fully dissipate, there is a significant increase in the cyclic strength with negligible change of relative density. One seismic event (15 cycles of cyclic shear stress ratio ~ 0.147 and drainage) can increase the cyclic shear strength of an initially DR ~ 25% specimen to be stronger than an initially DR ~ 50% specimen. The results also show that as the intensity of the cyclic loading increases, the increase in the cyclic shear strength increases. However, in the case when cyclic loads lead to full liquefaction and subsequent drainage is allowed, although overall densification is observed, cyclic shear strength can either increase or decrease depending on the permanent deformation of the preceding undrained cyclic loading phase. The cyclic shear strength increases when the previous permanent (compressive) axial strain is less than 1%, and decreases when the permanent axial strain is 5%. Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 seismic strengthening diatomaceous mud Ottawa Sand shear strength earthquake resistance liquefaction consolidation triaxial test Japan Trench Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Kopf, Achim akademischer betreuerin dgs Camerlenghi, Angelo akademischer betreuerin dgs Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Wu, Ting-Wei Quantitative geotechnical characterization of seismic strengthening effect on siliceous soils Bremen, 2021 187 Seiten (DE-627)1765965519 http://dx.doi.org/10.26092/elib/897 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 Resolving-System kostenfrei https://d-nb.info/1338946188/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/5100 Verlag kostenfrei GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER DSpace BO 20 01 0084 4593075475 x 12-10-24 21 01 0046 3963746394 ebook_2021_dissbremen Kostenloser Zugriff zza 09-08-21 22 01 0018 4593178894 SUBolrd xu 12-10-24 23 01 0830 4593228190 olr-d x 12-10-24 30 01 0104 4593274974 z 12-10-24 40 01 0007 4593308682 xsn 12-10-24 60 01 0705 4593366054 OLRD z 12-10-24 63 01 3401 4593422191 ORD x 12-10-24 70 01 0089 4593472032 z 12-10-24 105 01 0841 4593864100 z 12-10-24 110 01 3110 4593576563 x 12-10-24 132 01 0959 4593620406 OLR-DISS x 12-10-24 151 01 0546 4593664314 OLR-ODISS z 12-10-24 161 01 0960 4593687071 ORD z 12-10-24 293 01 3293 4593814421 ORD z 12-10-24 370 01 4370 4593853451 x 12-10-24 2403 01 DE-LFER 3984082762 00 --%%-- --%%-- n --%%-- l01 04-10-21 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 21 01 0046 https://doi.org/10.26092/elib/897 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 2403 01 DE-LFER http://dx.doi.org/10.26092/elib/897 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2021_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2024-10-12 10:31:16 |
allfieldsGer |
urn:nbn:de:gbv:46-elib51007 urn 10.26092/elib/897 doi (DE-627)1765965292 (DE-599)KXP1765965292 (OCoLC)1263179637 DE-627 ger DE-627 rda eng XA-DE-HB 551.468 DE-101 550 DE-101 Wu, Ting-Wei verfasserin (orcid)0000-0002-9587-0222 aut Quantitative geotechnical characterization of seismic strengthening effect on siliceous soils submitted by/vorgelegt von Ting-Wei Wu Bremen 2021 1 Online-Ressource (187 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2021 This dissertation investigates the phenomenon of “seismic strengthening”, which can be relevant to submarine landslide studies in active continental margins. Given that seismic strengthening is complex in nature and highly variable in different types of mixed sediments in the marine realm, this dissertation focuses on two types of siliceous soils only: natural diatomaceous mud offshore Japan, and a silica sand standard from the USA for generic laboratory testing. These materials underwent multi-methodological geotechnical testing, and the results are presented in three manuscripts in collaboration with partner institutions in Norway, France and Austria. The first manuscript of this study presents a comprehensive analysis of the sedimentology and geotechnical properties of four recently acquired sediment cores (5 meters long) on the continental slopes adjacent to the Japan Trench and Nankai Trough. We observe unexpectedly high undrained shear strength and apparent overconsolidation in the Japan Trench slope cores. We propose that this is due to the presence of diatoms (~ 15% dry weight), which amplifies the strength gains via seismic strengthening due to high particle interlocking and surface roughness of the diatom frustules, especially after they are crushed and compacted by earthquakes. This is supported by comparison to samples from the Nankai Trough slope where diatoms are less abundant, and the shear strength follows the expected trend for active margin sediments. Following the observation of seismic strengthening from Japan, we developed dynamic testing procedures to simulate the effect of seismic shaking in the laboratory. In the second manuscript, we conduct undrained cyclic triaxial tests on Ottawa Sand under a mean effective stress of 100 kPa (~ 10 m depth). After the loading, we drain the excess pore pressure and measure the monotonic undrained shear strength. The cyclic loading and excess pore pressure drainage are used to simulate the effect of small to moderate seismic events on sand deposits. The result shows that the first cyclic loading and pore pressure drainage (first seismic event) can increase the sediment’s undrained shear strength by around 30% without much change in relative density (DR). We also observe that as the intensity of the shaking increases, the undrained shear strength increases. However, the undrained shear strength of a sample subjected to multiple seismic events does not show a clear trend to increase. The third manuscript focuses on the the effect of prior seismic events on the cyclic shear strength of Ottawa Sand. The results show that when cyclic loads only induce partial liquefaction (i.e. no failure) and subsequent drainage allows excess pore pressure to fully dissipate, there is a significant increase in the cyclic strength with negligible change of relative density. One seismic event (15 cycles of cyclic shear stress ratio ~ 0.147 and drainage) can increase the cyclic shear strength of an initially DR ~ 25% specimen to be stronger than an initially DR ~ 50% specimen. The results also show that as the intensity of the cyclic loading increases, the increase in the cyclic shear strength increases. However, in the case when cyclic loads lead to full liquefaction and subsequent drainage is allowed, although overall densification is observed, cyclic shear strength can either increase or decrease depending on the permanent deformation of the preceding undrained cyclic loading phase. The cyclic shear strength increases when the previous permanent (compressive) axial strain is less than 1%, and decreases when the permanent axial strain is 5%. Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 seismic strengthening diatomaceous mud Ottawa Sand shear strength earthquake resistance liquefaction consolidation triaxial test Japan Trench Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Kopf, Achim akademischer betreuerin dgs Camerlenghi, Angelo akademischer betreuerin dgs Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Wu, Ting-Wei Quantitative geotechnical characterization of seismic strengthening effect on siliceous soils Bremen, 2021 187 Seiten (DE-627)1765965519 http://dx.doi.org/10.26092/elib/897 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 Resolving-System kostenfrei https://d-nb.info/1338946188/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/5100 Verlag kostenfrei GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER DSpace BO 20 01 0084 4593075475 x 12-10-24 21 01 0046 3963746394 ebook_2021_dissbremen Kostenloser Zugriff zza 09-08-21 22 01 0018 4593178894 SUBolrd xu 12-10-24 23 01 0830 4593228190 olr-d x 12-10-24 30 01 0104 4593274974 z 12-10-24 40 01 0007 4593308682 xsn 12-10-24 60 01 0705 4593366054 OLRD z 12-10-24 63 01 3401 4593422191 ORD x 12-10-24 70 01 0089 4593472032 z 12-10-24 105 01 0841 4593864100 z 12-10-24 110 01 3110 4593576563 x 12-10-24 132 01 0959 4593620406 OLR-DISS x 12-10-24 151 01 0546 4593664314 OLR-ODISS z 12-10-24 161 01 0960 4593687071 ORD z 12-10-24 293 01 3293 4593814421 ORD z 12-10-24 370 01 4370 4593853451 x 12-10-24 2403 01 DE-LFER 3984082762 00 --%%-- --%%-- n --%%-- l01 04-10-21 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 21 01 0046 https://doi.org/10.26092/elib/897 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 2403 01 DE-LFER http://dx.doi.org/10.26092/elib/897 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2021_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2024-10-12 10:31:16 |
allfieldsSound |
urn:nbn:de:gbv:46-elib51007 urn 10.26092/elib/897 doi (DE-627)1765965292 (DE-599)KXP1765965292 (OCoLC)1263179637 DE-627 ger DE-627 rda eng XA-DE-HB 551.468 DE-101 550 DE-101 Wu, Ting-Wei verfasserin (orcid)0000-0002-9587-0222 aut Quantitative geotechnical characterization of seismic strengthening effect on siliceous soils submitted by/vorgelegt von Ting-Wei Wu Bremen 2021 1 Online-Ressource (187 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2021 This dissertation investigates the phenomenon of “seismic strengthening”, which can be relevant to submarine landslide studies in active continental margins. Given that seismic strengthening is complex in nature and highly variable in different types of mixed sediments in the marine realm, this dissertation focuses on two types of siliceous soils only: natural diatomaceous mud offshore Japan, and a silica sand standard from the USA for generic laboratory testing. These materials underwent multi-methodological geotechnical testing, and the results are presented in three manuscripts in collaboration with partner institutions in Norway, France and Austria. The first manuscript of this study presents a comprehensive analysis of the sedimentology and geotechnical properties of four recently acquired sediment cores (5 meters long) on the continental slopes adjacent to the Japan Trench and Nankai Trough. We observe unexpectedly high undrained shear strength and apparent overconsolidation in the Japan Trench slope cores. We propose that this is due to the presence of diatoms (~ 15% dry weight), which amplifies the strength gains via seismic strengthening due to high particle interlocking and surface roughness of the diatom frustules, especially after they are crushed and compacted by earthquakes. This is supported by comparison to samples from the Nankai Trough slope where diatoms are less abundant, and the shear strength follows the expected trend for active margin sediments. Following the observation of seismic strengthening from Japan, we developed dynamic testing procedures to simulate the effect of seismic shaking in the laboratory. In the second manuscript, we conduct undrained cyclic triaxial tests on Ottawa Sand under a mean effective stress of 100 kPa (~ 10 m depth). After the loading, we drain the excess pore pressure and measure the monotonic undrained shear strength. The cyclic loading and excess pore pressure drainage are used to simulate the effect of small to moderate seismic events on sand deposits. The result shows that the first cyclic loading and pore pressure drainage (first seismic event) can increase the sediment’s undrained shear strength by around 30% without much change in relative density (DR). We also observe that as the intensity of the shaking increases, the undrained shear strength increases. However, the undrained shear strength of a sample subjected to multiple seismic events does not show a clear trend to increase. The third manuscript focuses on the the effect of prior seismic events on the cyclic shear strength of Ottawa Sand. The results show that when cyclic loads only induce partial liquefaction (i.e. no failure) and subsequent drainage allows excess pore pressure to fully dissipate, there is a significant increase in the cyclic strength with negligible change of relative density. One seismic event (15 cycles of cyclic shear stress ratio ~ 0.147 and drainage) can increase the cyclic shear strength of an initially DR ~ 25% specimen to be stronger than an initially DR ~ 50% specimen. The results also show that as the intensity of the cyclic loading increases, the increase in the cyclic shear strength increases. However, in the case when cyclic loads lead to full liquefaction and subsequent drainage is allowed, although overall densification is observed, cyclic shear strength can either increase or decrease depending on the permanent deformation of the preceding undrained cyclic loading phase. The cyclic shear strength increases when the previous permanent (compressive) axial strain is less than 1%, and decreases when the permanent axial strain is 5%. Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 seismic strengthening diatomaceous mud Ottawa Sand shear strength earthquake resistance liquefaction consolidation triaxial test Japan Trench Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Kopf, Achim akademischer betreuerin dgs Camerlenghi, Angelo akademischer betreuerin dgs Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Wu, Ting-Wei Quantitative geotechnical characterization of seismic strengthening effect on siliceous soils Bremen, 2021 187 Seiten (DE-627)1765965519 http://dx.doi.org/10.26092/elib/897 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 Resolving-System kostenfrei https://d-nb.info/1338946188/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/5100 Verlag kostenfrei GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER DSpace BO 20 01 0084 4593075475 x 12-10-24 21 01 0046 3963746394 ebook_2021_dissbremen Kostenloser Zugriff zza 09-08-21 22 01 0018 4593178894 SUBolrd xu 12-10-24 23 01 0830 4593228190 olr-d x 12-10-24 30 01 0104 4593274974 z 12-10-24 40 01 0007 4593308682 xsn 12-10-24 60 01 0705 4593366054 OLRD z 12-10-24 63 01 3401 4593422191 ORD x 12-10-24 70 01 0089 4593472032 z 12-10-24 105 01 0841 4593864100 z 12-10-24 110 01 3110 4593576563 x 12-10-24 132 01 0959 4593620406 OLR-DISS x 12-10-24 151 01 0546 4593664314 OLR-ODISS z 12-10-24 161 01 0960 4593687071 ORD z 12-10-24 293 01 3293 4593814421 ORD z 12-10-24 370 01 4370 4593853451 x 12-10-24 2403 01 DE-LFER 3984082762 00 --%%-- --%%-- n --%%-- l01 04-10-21 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 21 01 0046 https://doi.org/10.26092/elib/897 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 2403 01 DE-LFER http://dx.doi.org/10.26092/elib/897 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2021_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2024-10-12 10:31:16 |
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<?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>01000cam a2200265 4500</leader><controlfield tag="001">1765965292</controlfield><controlfield tag="003">DE-627</controlfield><controlfield tag="005">20240912024829.0</controlfield><controlfield tag="007">cr uuu---uuuuu</controlfield><controlfield tag="008">210809s2021 gw |||||om 00| ||eng c</controlfield><datafield tag="024" ind1="7" ind2=" "><subfield code="a">urn:nbn:de:gbv:46-elib51007</subfield><subfield code="2">urn</subfield></datafield><datafield tag="024" ind1="7" ind2=" "><subfield code="a">10.26092/elib/897</subfield><subfield code="2">doi</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-627)1765965292</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-599)KXP1765965292</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(OCoLC)1263179637</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-627</subfield><subfield code="b">ger</subfield><subfield code="c">DE-627</subfield><subfield code="e">rda</subfield></datafield><datafield tag="041" ind1=" " ind2=" "><subfield code="a">eng</subfield></datafield><datafield tag="044" ind1=" " ind2=" "><subfield code="c">XA-DE-HB</subfield></datafield><datafield tag="082" ind1="0" ind2="4"><subfield code="a">551.468</subfield><subfield code="q">DE-101</subfield></datafield><datafield tag="082" ind1="0" ind2="4"><subfield code="a">550</subfield><subfield code="q">DE-101</subfield></datafield><datafield tag="100" ind1="1" ind2=" "><subfield code="a">Wu, Ting-Wei</subfield><subfield code="e">verfasserin</subfield><subfield code="0">(orcid)0000-0002-9587-0222</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Quantitative geotechnical characterization of seismic strengthening effect on siliceous soils</subfield><subfield code="c">submitted by/vorgelegt von Ting-Wei Wu</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="a">Bremen</subfield><subfield code="c">2021</subfield></datafield><datafield tag="300" ind1=" " ind2=" "><subfield code="a">1 Online-Ressource (187 Seiten)</subfield><subfield code="b">Illustrationen</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">Computermedien</subfield><subfield code="b">c</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Online-Ressource</subfield><subfield code="b">cr</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="502" ind1=" " ind2=" "><subfield code="b">Dissertation</subfield><subfield code="c">Universität Bremen</subfield><subfield code="d">2021</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">This dissertation investigates the phenomenon of “seismic strengthening”, which can be relevant to submarine landslide studies in active continental margins. Given that seismic strengthening is complex in nature and highly variable in different types of mixed sediments in the marine realm, this dissertation focuses on two types of siliceous soils only: natural diatomaceous mud offshore Japan, and a silica sand standard from the USA for generic laboratory testing. These materials underwent multi-methodological geotechnical testing, and the results are presented in three manuscripts in collaboration with partner institutions in Norway, France and Austria. The first manuscript of this study presents a comprehensive analysis of the sedimentology and geotechnical properties of four recently acquired sediment cores (5 meters long) on the continental slopes adjacent to the Japan Trench and Nankai Trough. We observe unexpectedly high undrained shear strength and apparent overconsolidation in the Japan Trench slope cores. We propose that this is due to the presence of diatoms (~ 15% dry weight), which amplifies the strength gains via seismic strengthening due to high particle interlocking and surface roughness of the diatom frustules, especially after they are crushed and compacted by earthquakes. This is supported by comparison to samples from the Nankai Trough slope where diatoms are less abundant, and the shear strength follows the expected trend for active margin sediments. Following the observation of seismic strengthening from Japan, we developed dynamic testing procedures to simulate the effect of seismic shaking in the laboratory. In the second manuscript, we conduct undrained cyclic triaxial tests on Ottawa Sand under a mean effective stress of 100 kPa (~ 10 m depth). After the loading, we drain the excess pore pressure and measure the monotonic undrained shear strength. The cyclic loading and excess pore pressure drainage are used to simulate the effect of small to moderate seismic events on sand deposits. The result shows that the first cyclic loading and pore pressure drainage (first seismic event) can increase the sediment’s undrained shear strength by around 30% without much change in relative density (DR). We also observe that as the intensity of the shaking increases, the undrained shear strength increases. However, the undrained shear strength of a sample subjected to multiple seismic events does not show a clear trend to increase. The third manuscript focuses on the the effect of prior seismic events on the cyclic shear strength of Ottawa Sand. The results show that when cyclic loads only induce partial liquefaction (i.e. no failure) and subsequent drainage allows excess pore pressure to fully dissipate, there is a significant increase in the cyclic strength with negligible change of relative density. One seismic event (15 cycles of cyclic shear stress ratio ~ 0.147 and drainage) can increase the cyclic shear strength of an initially DR ~ 25% specimen to be stronger than an initially DR ~ 50% specimen. The results also show that as the intensity of the cyclic loading increases, the increase in the cyclic shear strength increases. However, in the case when cyclic loads lead to full liquefaction and subsequent drainage is allowed, although overall densification is observed, cyclic shear strength can either increase or decrease depending on the permanent deformation of the preceding undrained cyclic loading phase. 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Quantitative geotechnical characterization of seismic strengthening effect on siliceous soils |
abstract |
This dissertation investigates the phenomenon of “seismic strengthening”, which can be relevant to submarine landslide studies in active continental margins. Given that seismic strengthening is complex in nature and highly variable in different types of mixed sediments in the marine realm, this dissertation focuses on two types of siliceous soils only: natural diatomaceous mud offshore Japan, and a silica sand standard from the USA for generic laboratory testing. These materials underwent multi-methodological geotechnical testing, and the results are presented in three manuscripts in collaboration with partner institutions in Norway, France and Austria. The first manuscript of this study presents a comprehensive analysis of the sedimentology and geotechnical properties of four recently acquired sediment cores (5 meters long) on the continental slopes adjacent to the Japan Trench and Nankai Trough. We observe unexpectedly high undrained shear strength and apparent overconsolidation in the Japan Trench slope cores. We propose that this is due to the presence of diatoms (~ 15% dry weight), which amplifies the strength gains via seismic strengthening due to high particle interlocking and surface roughness of the diatom frustules, especially after they are crushed and compacted by earthquakes. This is supported by comparison to samples from the Nankai Trough slope where diatoms are less abundant, and the shear strength follows the expected trend for active margin sediments. Following the observation of seismic strengthening from Japan, we developed dynamic testing procedures to simulate the effect of seismic shaking in the laboratory. In the second manuscript, we conduct undrained cyclic triaxial tests on Ottawa Sand under a mean effective stress of 100 kPa (~ 10 m depth). After the loading, we drain the excess pore pressure and measure the monotonic undrained shear strength. The cyclic loading and excess pore pressure drainage are used to simulate the effect of small to moderate seismic events on sand deposits. The result shows that the first cyclic loading and pore pressure drainage (first seismic event) can increase the sediment’s undrained shear strength by around 30% without much change in relative density (DR). We also observe that as the intensity of the shaking increases, the undrained shear strength increases. However, the undrained shear strength of a sample subjected to multiple seismic events does not show a clear trend to increase. The third manuscript focuses on the the effect of prior seismic events on the cyclic shear strength of Ottawa Sand. The results show that when cyclic loads only induce partial liquefaction (i.e. no failure) and subsequent drainage allows excess pore pressure to fully dissipate, there is a significant increase in the cyclic strength with negligible change of relative density. One seismic event (15 cycles of cyclic shear stress ratio ~ 0.147 and drainage) can increase the cyclic shear strength of an initially DR ~ 25% specimen to be stronger than an initially DR ~ 50% specimen. The results also show that as the intensity of the cyclic loading increases, the increase in the cyclic shear strength increases. However, in the case when cyclic loads lead to full liquefaction and subsequent drainage is allowed, although overall densification is observed, cyclic shear strength can either increase or decrease depending on the permanent deformation of the preceding undrained cyclic loading phase. The cyclic shear strength increases when the previous permanent (compressive) axial strain is less than 1%, and decreases when the permanent axial strain is 5%. |
abstractGer |
This dissertation investigates the phenomenon of “seismic strengthening”, which can be relevant to submarine landslide studies in active continental margins. Given that seismic strengthening is complex in nature and highly variable in different types of mixed sediments in the marine realm, this dissertation focuses on two types of siliceous soils only: natural diatomaceous mud offshore Japan, and a silica sand standard from the USA for generic laboratory testing. These materials underwent multi-methodological geotechnical testing, and the results are presented in three manuscripts in collaboration with partner institutions in Norway, France and Austria. The first manuscript of this study presents a comprehensive analysis of the sedimentology and geotechnical properties of four recently acquired sediment cores (5 meters long) on the continental slopes adjacent to the Japan Trench and Nankai Trough. We observe unexpectedly high undrained shear strength and apparent overconsolidation in the Japan Trench slope cores. We propose that this is due to the presence of diatoms (~ 15% dry weight), which amplifies the strength gains via seismic strengthening due to high particle interlocking and surface roughness of the diatom frustules, especially after they are crushed and compacted by earthquakes. This is supported by comparison to samples from the Nankai Trough slope where diatoms are less abundant, and the shear strength follows the expected trend for active margin sediments. Following the observation of seismic strengthening from Japan, we developed dynamic testing procedures to simulate the effect of seismic shaking in the laboratory. In the second manuscript, we conduct undrained cyclic triaxial tests on Ottawa Sand under a mean effective stress of 100 kPa (~ 10 m depth). After the loading, we drain the excess pore pressure and measure the monotonic undrained shear strength. The cyclic loading and excess pore pressure drainage are used to simulate the effect of small to moderate seismic events on sand deposits. The result shows that the first cyclic loading and pore pressure drainage (first seismic event) can increase the sediment’s undrained shear strength by around 30% without much change in relative density (DR). We also observe that as the intensity of the shaking increases, the undrained shear strength increases. However, the undrained shear strength of a sample subjected to multiple seismic events does not show a clear trend to increase. The third manuscript focuses on the the effect of prior seismic events on the cyclic shear strength of Ottawa Sand. The results show that when cyclic loads only induce partial liquefaction (i.e. no failure) and subsequent drainage allows excess pore pressure to fully dissipate, there is a significant increase in the cyclic strength with negligible change of relative density. One seismic event (15 cycles of cyclic shear stress ratio ~ 0.147 and drainage) can increase the cyclic shear strength of an initially DR ~ 25% specimen to be stronger than an initially DR ~ 50% specimen. The results also show that as the intensity of the cyclic loading increases, the increase in the cyclic shear strength increases. However, in the case when cyclic loads lead to full liquefaction and subsequent drainage is allowed, although overall densification is observed, cyclic shear strength can either increase or decrease depending on the permanent deformation of the preceding undrained cyclic loading phase. The cyclic shear strength increases when the previous permanent (compressive) axial strain is less than 1%, and decreases when the permanent axial strain is 5%. |
abstract_unstemmed |
This dissertation investigates the phenomenon of “seismic strengthening”, which can be relevant to submarine landslide studies in active continental margins. Given that seismic strengthening is complex in nature and highly variable in different types of mixed sediments in the marine realm, this dissertation focuses on two types of siliceous soils only: natural diatomaceous mud offshore Japan, and a silica sand standard from the USA for generic laboratory testing. These materials underwent multi-methodological geotechnical testing, and the results are presented in three manuscripts in collaboration with partner institutions in Norway, France and Austria. The first manuscript of this study presents a comprehensive analysis of the sedimentology and geotechnical properties of four recently acquired sediment cores (5 meters long) on the continental slopes adjacent to the Japan Trench and Nankai Trough. We observe unexpectedly high undrained shear strength and apparent overconsolidation in the Japan Trench slope cores. We propose that this is due to the presence of diatoms (~ 15% dry weight), which amplifies the strength gains via seismic strengthening due to high particle interlocking and surface roughness of the diatom frustules, especially after they are crushed and compacted by earthquakes. This is supported by comparison to samples from the Nankai Trough slope where diatoms are less abundant, and the shear strength follows the expected trend for active margin sediments. Following the observation of seismic strengthening from Japan, we developed dynamic testing procedures to simulate the effect of seismic shaking in the laboratory. In the second manuscript, we conduct undrained cyclic triaxial tests on Ottawa Sand under a mean effective stress of 100 kPa (~ 10 m depth). After the loading, we drain the excess pore pressure and measure the monotonic undrained shear strength. The cyclic loading and excess pore pressure drainage are used to simulate the effect of small to moderate seismic events on sand deposits. The result shows that the first cyclic loading and pore pressure drainage (first seismic event) can increase the sediment’s undrained shear strength by around 30% without much change in relative density (DR). We also observe that as the intensity of the shaking increases, the undrained shear strength increases. However, the undrained shear strength of a sample subjected to multiple seismic events does not show a clear trend to increase. The third manuscript focuses on the the effect of prior seismic events on the cyclic shear strength of Ottawa Sand. The results show that when cyclic loads only induce partial liquefaction (i.e. no failure) and subsequent drainage allows excess pore pressure to fully dissipate, there is a significant increase in the cyclic strength with negligible change of relative density. One seismic event (15 cycles of cyclic shear stress ratio ~ 0.147 and drainage) can increase the cyclic shear strength of an initially DR ~ 25% specimen to be stronger than an initially DR ~ 50% specimen. The results also show that as the intensity of the cyclic loading increases, the increase in the cyclic shear strength increases. However, in the case when cyclic loads lead to full liquefaction and subsequent drainage is allowed, although overall densification is observed, cyclic shear strength can either increase or decrease depending on the permanent deformation of the preceding undrained cyclic loading phase. The cyclic shear strength increases when the previous permanent (compressive) axial strain is less than 1%, and decreases when the permanent axial strain is 5%. |
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title_short |
Quantitative geotechnical characterization of seismic strengthening effect on siliceous soils |
url |
http://dx.doi.org/10.26092/elib/897 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib51007 https://d-nb.info/1338946188/34 https://media.suub.uni-bremen.de/handle/elib/5100 |
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Kopf, Achim Camerlenghi, Angelo Universität Bremen |
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