Three-dimensional stress variation characteristics in deep hard rock of CJPL-II project based on in-situ monitoring

In deep hard rock excavation, stress plays a pivotal role in inducing stress-controlled failure. While the impact of excavation-induced stress disturbance on rock failure and tunnel stability has undergone comprehensive examination through laboratory tests and numerical simulations, its validation t...
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Autor*in:	Minzong Zheng [verfasserIn] Shaojun Li [verfasserIn] Zejie Feng [verfasserIn] Huaisheng Xu [verfasserIn] Yaxun Xiao [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2024

Schlagwörter:	Disturbance stress Tensor distance Stress disturbance index Principal stress direction Underground research laboratory

Übergeordnetes Werk:	In: International Journal of Mining Science and Technology - Elsevier, 2018, 34(2024), 2, Seite 179-195
Übergeordnetes Werk:	volume:34 ; year:2024 ; number:2 ; pages:179-195

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.1016/j.ijmst.2023.12.007

Katalog-ID:	DOAJ100908918

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520			\|a In deep hard rock excavation, stress plays a pivotal role in inducing stress-controlled failure. While the impact of excavation-induced stress disturbance on rock failure and tunnel stability has undergone comprehensive examination through laboratory tests and numerical simulations, its validation through in-situ stress tests remains unexplored. This study analyzes the three-dimensional stress changes in the surrounding rock at various depths, monitored during the excavation of B2 Lab in China Jinping Underground Laboratory Phase II (CJPL-II). The investigation delves into the three-dimensional stress variation characteristics in deep hard rock, encompassing stress components and principal stress. The results indicate changes in both the magnitude and direction of the principal stress during tunnel excavation. To quantitatively describe the degree of stress disturbance, a series of stress evaluation indexes are established based on the distances between stress tensors, including the stress disturbance index (SDI), the principal stress magnitude disturbance index (SDIm), and the principal stress direction disturbance index (SDId). The SDI indicates the greatest stress disturbance in the surrounding rock is 4.5 m from the tunnel wall in B2 Lab. SDIm shows that the principal stress magnitude disturbance peaks at 2.5 m from the tunnel wall. SDId reveals that the largest change in principal stress direction does not necessarily occur near the tunnel wall but at a specific depth from it. The established relationship between SDI and the depth of the excavation damaged zone (EDZ) can serve as a criterion for determining the depth of the EDZ in deep hard rock engineering. Additionally, it provides a reference for future construction and support considerations.
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callnumber-first	T - Technology
author	Minzong Zheng
spellingShingle	Minzong Zheng misc TN1-997 misc Disturbance stress misc Tensor distance misc Stress disturbance index misc Principal stress direction misc Underground research laboratory misc Mining engineering. Metallurgy Three-dimensional stress variation characteristics in deep hard rock of CJPL-II project based on in-situ monitoring
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topic_title	TN1-997 Three-dimensional stress variation characteristics in deep hard rock of CJPL-II project based on in-situ monitoring Disturbance stress Tensor distance Stress disturbance index Principal stress direction Underground research laboratory
topic	misc TN1-997 misc Disturbance stress misc Tensor distance misc Stress disturbance index misc Principal stress direction misc Underground research laboratory misc Mining engineering. Metallurgy
topic_unstemmed	misc TN1-997 misc Disturbance stress misc Tensor distance misc Stress disturbance index misc Principal stress direction misc Underground research laboratory misc Mining engineering. Metallurgy
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title	Three-dimensional stress variation characteristics in deep hard rock of CJPL-II project based on in-situ monitoring
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title_sort	three-dimensional stress variation characteristics in deep hard rock of cjpl-ii project based on in-situ monitoring
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title_auth	Three-dimensional stress variation characteristics in deep hard rock of CJPL-II project based on in-situ monitoring
abstract	In deep hard rock excavation, stress plays a pivotal role in inducing stress-controlled failure. While the impact of excavation-induced stress disturbance on rock failure and tunnel stability has undergone comprehensive examination through laboratory tests and numerical simulations, its validation through in-situ stress tests remains unexplored. This study analyzes the three-dimensional stress changes in the surrounding rock at various depths, monitored during the excavation of B2 Lab in China Jinping Underground Laboratory Phase II (CJPL-II). The investigation delves into the three-dimensional stress variation characteristics in deep hard rock, encompassing stress components and principal stress. The results indicate changes in both the magnitude and direction of the principal stress during tunnel excavation. To quantitatively describe the degree of stress disturbance, a series of stress evaluation indexes are established based on the distances between stress tensors, including the stress disturbance index (SDI), the principal stress magnitude disturbance index (SDIm), and the principal stress direction disturbance index (SDId). The SDI indicates the greatest stress disturbance in the surrounding rock is 4.5 m from the tunnel wall in B2 Lab. SDIm shows that the principal stress magnitude disturbance peaks at 2.5 m from the tunnel wall. SDId reveals that the largest change in principal stress direction does not necessarily occur near the tunnel wall but at a specific depth from it. The established relationship between SDI and the depth of the excavation damaged zone (EDZ) can serve as a criterion for determining the depth of the EDZ in deep hard rock engineering. Additionally, it provides a reference for future construction and support considerations.
abstractGer	In deep hard rock excavation, stress plays a pivotal role in inducing stress-controlled failure. While the impact of excavation-induced stress disturbance on rock failure and tunnel stability has undergone comprehensive examination through laboratory tests and numerical simulations, its validation through in-situ stress tests remains unexplored. This study analyzes the three-dimensional stress changes in the surrounding rock at various depths, monitored during the excavation of B2 Lab in China Jinping Underground Laboratory Phase II (CJPL-II). The investigation delves into the three-dimensional stress variation characteristics in deep hard rock, encompassing stress components and principal stress. The results indicate changes in both the magnitude and direction of the principal stress during tunnel excavation. To quantitatively describe the degree of stress disturbance, a series of stress evaluation indexes are established based on the distances between stress tensors, including the stress disturbance index (SDI), the principal stress magnitude disturbance index (SDIm), and the principal stress direction disturbance index (SDId). The SDI indicates the greatest stress disturbance in the surrounding rock is 4.5 m from the tunnel wall in B2 Lab. SDIm shows that the principal stress magnitude disturbance peaks at 2.5 m from the tunnel wall. SDId reveals that the largest change in principal stress direction does not necessarily occur near the tunnel wall but at a specific depth from it. The established relationship between SDI and the depth of the excavation damaged zone (EDZ) can serve as a criterion for determining the depth of the EDZ in deep hard rock engineering. Additionally, it provides a reference for future construction and support considerations.
abstract_unstemmed	In deep hard rock excavation, stress plays a pivotal role in inducing stress-controlled failure. While the impact of excavation-induced stress disturbance on rock failure and tunnel stability has undergone comprehensive examination through laboratory tests and numerical simulations, its validation through in-situ stress tests remains unexplored. This study analyzes the three-dimensional stress changes in the surrounding rock at various depths, monitored during the excavation of B2 Lab in China Jinping Underground Laboratory Phase II (CJPL-II). The investigation delves into the three-dimensional stress variation characteristics in deep hard rock, encompassing stress components and principal stress. The results indicate changes in both the magnitude and direction of the principal stress during tunnel excavation. To quantitatively describe the degree of stress disturbance, a series of stress evaluation indexes are established based on the distances between stress tensors, including the stress disturbance index (SDI), the principal stress magnitude disturbance index (SDIm), and the principal stress direction disturbance index (SDId). The SDI indicates the greatest stress disturbance in the surrounding rock is 4.5 m from the tunnel wall in B2 Lab. SDIm shows that the principal stress magnitude disturbance peaks at 2.5 m from the tunnel wall. SDId reveals that the largest change in principal stress direction does not necessarily occur near the tunnel wall but at a specific depth from it. The established relationship between SDI and the depth of the excavation damaged zone (EDZ) can serve as a criterion for determining the depth of the EDZ in deep hard rock engineering. Additionally, it provides a reference for future construction and support considerations.
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title_short	Three-dimensional stress variation characteristics in deep hard rock of CJPL-II project based on in-situ monitoring
url	https://doi.org/10.1016/j.ijmst.2023.12.007 https://doaj.org/article/9fa19b555ca94227a7bb5cf2789cd3e5 http://www.sciencedirect.com/science/article/pii/S2095268624000107 https://doaj.org/toc/2095-2686
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To quantitatively describe the degree of stress disturbance, a series of stress evaluation indexes are established based on the distances between stress tensors, including the stress disturbance index (SDI), the principal stress magnitude disturbance index (SDIm), and the principal stress direction disturbance index (SDId). The SDI indicates the greatest stress disturbance in the surrounding rock is 4.5 m from the tunnel wall in B2 Lab. SDIm shows that the principal stress magnitude disturbance peaks at 2.5 m from the tunnel wall. SDId reveals that the largest change in principal stress direction does not necessarily occur near the tunnel wall but at a specific depth from it. The established relationship between SDI and the depth of the excavation damaged zone (EDZ) can serve as a criterion for determining the depth of the EDZ in deep hard rock engineering. 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Metallurgy</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">Shaojun Li</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">Zejie Feng</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">Huaisheng Xu</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">Yaxun Xiao</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">In</subfield><subfield code="t">International Journal of Mining Science and Technology</subfield><subfield code="d">Elsevier, 2018</subfield><subfield code="g">34(2024), 2, Seite 179-195</subfield><subfield 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Three-dimensional stress variation characteristics in deep hard rock of CJPL-II project based on in-situ monitoring

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