Evaluation of methods for determining rock brittleness under compression
Accurate assessment of brittleness of rock material is of great significance in the fields of underground mining engineering and unconventional oil and gas reservoirs. In this study, the existing methods for determining rock brittleness were reviewed in detail. Nevertheless, they encounter their own...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Tao, Wen [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2020transfer abstract |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: One-step solution-combustion synthesis of complex spinel titanate flake particles with enhanced lithium-storage properties - Li, Xue ELSEVIER, 2015transfer abstract, Amsterdam [u.a.] |
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| Übergeordnetes Werk: |
volume:78 ; year:2020 ; pages:0 |
| Links: |
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| DOI / URN: |
10.1016/j.jngse.2020.103321 |
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ELV050219391 |
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| 520 | |a Accurate assessment of brittleness of rock material is of great significance in the fields of underground mining engineering and unconventional oil and gas reservoirs. In this study, the existing methods for determining rock brittleness were reviewed in detail. Nevertheless, they encounter their own limitations in dealing with some special situations. Therefore, two brittleness indexes under compression are proposed based on energy evolution analysis in the complete process of deformation and failure of the rock. The proposed brittleness indexes consider the elastic strain energy and the dissipation energy before peak strength (PS) and the influence of post-peak stress drop. Then, the applicability of the proposed brittleness indexes is validated by the collected datasets of uniaxial and triaxial compression tests results under different confinements for ten rock types. The results indicate that the values of two proposed indexes have positive correlations with confining pressure while have negative correlations with the rock brittleness. Finally, seven brittleness indexes are selected to further compare the rationality of the proposed brittleness indexes. The comparisons show that the results determined by the two brittleness indexes are different from other brittleness indexes while they can also describe the brittle characteristics of each rock types. The comparisons also prove either insufficient physical basis or inappropriate expression strategy in the existing brittleness indexes. Accordingly, the proposed methods for determining the rock brittleness seem to offer reliable evaluations of the rock brittleness in various rock types. This study provides a novel approach for quantitative evaluation of the rock brittleness, the results of which improve the existing methods and also enrich our understanding of the rock brittleness. | ||
| 520 | |a Accurate assessment of brittleness of rock material is of great significance in the fields of underground mining engineering and unconventional oil and gas reservoirs. In this study, the existing methods for determining rock brittleness were reviewed in detail. Nevertheless, they encounter their own limitations in dealing with some special situations. Therefore, two brittleness indexes under compression are proposed based on energy evolution analysis in the complete process of deformation and failure of the rock. The proposed brittleness indexes consider the elastic strain energy and the dissipation energy before peak strength (PS) and the influence of post-peak stress drop. Then, the applicability of the proposed brittleness indexes is validated by the collected datasets of uniaxial and triaxial compression tests results under different confinements for ten rock types. The results indicate that the values of two proposed indexes have positive correlations with confining pressure while have negative correlations with the rock brittleness. Finally, seven brittleness indexes are selected to further compare the rationality of the proposed brittleness indexes. The comparisons show that the results determined by the two brittleness indexes are different from other brittleness indexes while they can also describe the brittle characteristics of each rock types. The comparisons also prove either insufficient physical basis or inappropriate expression strategy in the existing brittleness indexes. Accordingly, the proposed methods for determining the rock brittleness seem to offer reliable evaluations of the rock brittleness in various rock types. This study provides a novel approach for quantitative evaluation of the rock brittleness, the results of which improve the existing methods and also enrich our understanding of the rock brittleness. | ||
| 650 | 7 | |a Brittle |2 Elsevier | |
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| 700 | 1 | |a Wang, Yankun |4 oth | |
| 700 | 1 | |a Ma, Junwei |4 oth | |
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10.1016/j.jngse.2020.103321 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001280.pica (DE-627)ELV050219391 (ELSEVIER)S1875-5100(20)30175-X DE-627 ger DE-627 rakwb eng 620 VZ 690 VZ 50.92 bkl Tao, Wen verfasserin aut Evaluation of methods for determining rock brittleness under compression 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Accurate assessment of brittleness of rock material is of great significance in the fields of underground mining engineering and unconventional oil and gas reservoirs. In this study, the existing methods for determining rock brittleness were reviewed in detail. Nevertheless, they encounter their own limitations in dealing with some special situations. Therefore, two brittleness indexes under compression are proposed based on energy evolution analysis in the complete process of deformation and failure of the rock. The proposed brittleness indexes consider the elastic strain energy and the dissipation energy before peak strength (PS) and the influence of post-peak stress drop. Then, the applicability of the proposed brittleness indexes is validated by the collected datasets of uniaxial and triaxial compression tests results under different confinements for ten rock types. The results indicate that the values of two proposed indexes have positive correlations with confining pressure while have negative correlations with the rock brittleness. Finally, seven brittleness indexes are selected to further compare the rationality of the proposed brittleness indexes. The comparisons show that the results determined by the two brittleness indexes are different from other brittleness indexes while they can also describe the brittle characteristics of each rock types. The comparisons also prove either insufficient physical basis or inappropriate expression strategy in the existing brittleness indexes. Accordingly, the proposed methods for determining the rock brittleness seem to offer reliable evaluations of the rock brittleness in various rock types. This study provides a novel approach for quantitative evaluation of the rock brittleness, the results of which improve the existing methods and also enrich our understanding of the rock brittleness. Accurate assessment of brittleness of rock material is of great significance in the fields of underground mining engineering and unconventional oil and gas reservoirs. In this study, the existing methods for determining rock brittleness were reviewed in detail. Nevertheless, they encounter their own limitations in dealing with some special situations. Therefore, two brittleness indexes under compression are proposed based on energy evolution analysis in the complete process of deformation and failure of the rock. The proposed brittleness indexes consider the elastic strain energy and the dissipation energy before peak strength (PS) and the influence of post-peak stress drop. Then, the applicability of the proposed brittleness indexes is validated by the collected datasets of uniaxial and triaxial compression tests results under different confinements for ten rock types. The results indicate that the values of two proposed indexes have positive correlations with confining pressure while have negative correlations with the rock brittleness. Finally, seven brittleness indexes are selected to further compare the rationality of the proposed brittleness indexes. The comparisons show that the results determined by the two brittleness indexes are different from other brittleness indexes while they can also describe the brittle characteristics of each rock types. The comparisons also prove either insufficient physical basis or inappropriate expression strategy in the existing brittleness indexes. Accordingly, the proposed methods for determining the rock brittleness seem to offer reliable evaluations of the rock brittleness in various rock types. This study provides a novel approach for quantitative evaluation of the rock brittleness, the results of which improve the existing methods and also enrich our understanding of the rock brittleness. Brittle Elsevier Energy-based brittleness index Elsevier Stress-strain curves Elsevier Energy dissipation Elsevier Rock failure Elsevier Tang, Huiming oth Wang, Yankun oth Ma, Junwei oth Enthalten in Elsevier Li, Xue ELSEVIER One-step solution-combustion synthesis of complex spinel titanate flake particles with enhanced lithium-storage properties 2015transfer abstract Amsterdam [u.a.] (DE-627)ELV013144928 volume:78 year:2020 pages:0 https://doi.org/10.1016/j.jngse.2020.103321 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 50.92 Meerestechnik VZ AR 78 2020 0 |
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10.1016/j.jngse.2020.103321 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001280.pica (DE-627)ELV050219391 (ELSEVIER)S1875-5100(20)30175-X DE-627 ger DE-627 rakwb eng 620 VZ 690 VZ 50.92 bkl Tao, Wen verfasserin aut Evaluation of methods for determining rock brittleness under compression 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Accurate assessment of brittleness of rock material is of great significance in the fields of underground mining engineering and unconventional oil and gas reservoirs. In this study, the existing methods for determining rock brittleness were reviewed in detail. Nevertheless, they encounter their own limitations in dealing with some special situations. Therefore, two brittleness indexes under compression are proposed based on energy evolution analysis in the complete process of deformation and failure of the rock. The proposed brittleness indexes consider the elastic strain energy and the dissipation energy before peak strength (PS) and the influence of post-peak stress drop. Then, the applicability of the proposed brittleness indexes is validated by the collected datasets of uniaxial and triaxial compression tests results under different confinements for ten rock types. The results indicate that the values of two proposed indexes have positive correlations with confining pressure while have negative correlations with the rock brittleness. Finally, seven brittleness indexes are selected to further compare the rationality of the proposed brittleness indexes. The comparisons show that the results determined by the two brittleness indexes are different from other brittleness indexes while they can also describe the brittle characteristics of each rock types. The comparisons also prove either insufficient physical basis or inappropriate expression strategy in the existing brittleness indexes. Accordingly, the proposed methods for determining the rock brittleness seem to offer reliable evaluations of the rock brittleness in various rock types. This study provides a novel approach for quantitative evaluation of the rock brittleness, the results of which improve the existing methods and also enrich our understanding of the rock brittleness. Accurate assessment of brittleness of rock material is of great significance in the fields of underground mining engineering and unconventional oil and gas reservoirs. In this study, the existing methods for determining rock brittleness were reviewed in detail. Nevertheless, they encounter their own limitations in dealing with some special situations. Therefore, two brittleness indexes under compression are proposed based on energy evolution analysis in the complete process of deformation and failure of the rock. The proposed brittleness indexes consider the elastic strain energy and the dissipation energy before peak strength (PS) and the influence of post-peak stress drop. Then, the applicability of the proposed brittleness indexes is validated by the collected datasets of uniaxial and triaxial compression tests results under different confinements for ten rock types. The results indicate that the values of two proposed indexes have positive correlations with confining pressure while have negative correlations with the rock brittleness. Finally, seven brittleness indexes are selected to further compare the rationality of the proposed brittleness indexes. The comparisons show that the results determined by the two brittleness indexes are different from other brittleness indexes while they can also describe the brittle characteristics of each rock types. The comparisons also prove either insufficient physical basis or inappropriate expression strategy in the existing brittleness indexes. Accordingly, the proposed methods for determining the rock brittleness seem to offer reliable evaluations of the rock brittleness in various rock types. This study provides a novel approach for quantitative evaluation of the rock brittleness, the results of which improve the existing methods and also enrich our understanding of the rock brittleness. Brittle Elsevier Energy-based brittleness index Elsevier Stress-strain curves Elsevier Energy dissipation Elsevier Rock failure Elsevier Tang, Huiming oth Wang, Yankun oth Ma, Junwei oth Enthalten in Elsevier Li, Xue ELSEVIER One-step solution-combustion synthesis of complex spinel titanate flake particles with enhanced lithium-storage properties 2015transfer abstract Amsterdam [u.a.] (DE-627)ELV013144928 volume:78 year:2020 pages:0 https://doi.org/10.1016/j.jngse.2020.103321 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 50.92 Meerestechnik VZ AR 78 2020 0 |
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10.1016/j.jngse.2020.103321 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001280.pica (DE-627)ELV050219391 (ELSEVIER)S1875-5100(20)30175-X DE-627 ger DE-627 rakwb eng 620 VZ 690 VZ 50.92 bkl Tao, Wen verfasserin aut Evaluation of methods for determining rock brittleness under compression 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Accurate assessment of brittleness of rock material is of great significance in the fields of underground mining engineering and unconventional oil and gas reservoirs. In this study, the existing methods for determining rock brittleness were reviewed in detail. Nevertheless, they encounter their own limitations in dealing with some special situations. Therefore, two brittleness indexes under compression are proposed based on energy evolution analysis in the complete process of deformation and failure of the rock. The proposed brittleness indexes consider the elastic strain energy and the dissipation energy before peak strength (PS) and the influence of post-peak stress drop. Then, the applicability of the proposed brittleness indexes is validated by the collected datasets of uniaxial and triaxial compression tests results under different confinements for ten rock types. The results indicate that the values of two proposed indexes have positive correlations with confining pressure while have negative correlations with the rock brittleness. Finally, seven brittleness indexes are selected to further compare the rationality of the proposed brittleness indexes. The comparisons show that the results determined by the two brittleness indexes are different from other brittleness indexes while they can also describe the brittle characteristics of each rock types. The comparisons also prove either insufficient physical basis or inappropriate expression strategy in the existing brittleness indexes. Accordingly, the proposed methods for determining the rock brittleness seem to offer reliable evaluations of the rock brittleness in various rock types. This study provides a novel approach for quantitative evaluation of the rock brittleness, the results of which improve the existing methods and also enrich our understanding of the rock brittleness. Accurate assessment of brittleness of rock material is of great significance in the fields of underground mining engineering and unconventional oil and gas reservoirs. In this study, the existing methods for determining rock brittleness were reviewed in detail. Nevertheless, they encounter their own limitations in dealing with some special situations. Therefore, two brittleness indexes under compression are proposed based on energy evolution analysis in the complete process of deformation and failure of the rock. The proposed brittleness indexes consider the elastic strain energy and the dissipation energy before peak strength (PS) and the influence of post-peak stress drop. Then, the applicability of the proposed brittleness indexes is validated by the collected datasets of uniaxial and triaxial compression tests results under different confinements for ten rock types. The results indicate that the values of two proposed indexes have positive correlations with confining pressure while have negative correlations with the rock brittleness. Finally, seven brittleness indexes are selected to further compare the rationality of the proposed brittleness indexes. The comparisons show that the results determined by the two brittleness indexes are different from other brittleness indexes while they can also describe the brittle characteristics of each rock types. The comparisons also prove either insufficient physical basis or inappropriate expression strategy in the existing brittleness indexes. Accordingly, the proposed methods for determining the rock brittleness seem to offer reliable evaluations of the rock brittleness in various rock types. This study provides a novel approach for quantitative evaluation of the rock brittleness, the results of which improve the existing methods and also enrich our understanding of the rock brittleness. Brittle Elsevier Energy-based brittleness index Elsevier Stress-strain curves Elsevier Energy dissipation Elsevier Rock failure Elsevier Tang, Huiming oth Wang, Yankun oth Ma, Junwei oth Enthalten in Elsevier Li, Xue ELSEVIER One-step solution-combustion synthesis of complex spinel titanate flake particles with enhanced lithium-storage properties 2015transfer abstract Amsterdam [u.a.] (DE-627)ELV013144928 volume:78 year:2020 pages:0 https://doi.org/10.1016/j.jngse.2020.103321 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 50.92 Meerestechnik VZ AR 78 2020 0 |
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10.1016/j.jngse.2020.103321 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001280.pica (DE-627)ELV050219391 (ELSEVIER)S1875-5100(20)30175-X DE-627 ger DE-627 rakwb eng 620 VZ 690 VZ 50.92 bkl Tao, Wen verfasserin aut Evaluation of methods for determining rock brittleness under compression 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Accurate assessment of brittleness of rock material is of great significance in the fields of underground mining engineering and unconventional oil and gas reservoirs. In this study, the existing methods for determining rock brittleness were reviewed in detail. Nevertheless, they encounter their own limitations in dealing with some special situations. Therefore, two brittleness indexes under compression are proposed based on energy evolution analysis in the complete process of deformation and failure of the rock. The proposed brittleness indexes consider the elastic strain energy and the dissipation energy before peak strength (PS) and the influence of post-peak stress drop. Then, the applicability of the proposed brittleness indexes is validated by the collected datasets of uniaxial and triaxial compression tests results under different confinements for ten rock types. The results indicate that the values of two proposed indexes have positive correlations with confining pressure while have negative correlations with the rock brittleness. Finally, seven brittleness indexes are selected to further compare the rationality of the proposed brittleness indexes. The comparisons show that the results determined by the two brittleness indexes are different from other brittleness indexes while they can also describe the brittle characteristics of each rock types. The comparisons also prove either insufficient physical basis or inappropriate expression strategy in the existing brittleness indexes. Accordingly, the proposed methods for determining the rock brittleness seem to offer reliable evaluations of the rock brittleness in various rock types. This study provides a novel approach for quantitative evaluation of the rock brittleness, the results of which improve the existing methods and also enrich our understanding of the rock brittleness. Accurate assessment of brittleness of rock material is of great significance in the fields of underground mining engineering and unconventional oil and gas reservoirs. In this study, the existing methods for determining rock brittleness were reviewed in detail. Nevertheless, they encounter their own limitations in dealing with some special situations. Therefore, two brittleness indexes under compression are proposed based on energy evolution analysis in the complete process of deformation and failure of the rock. The proposed brittleness indexes consider the elastic strain energy and the dissipation energy before peak strength (PS) and the influence of post-peak stress drop. Then, the applicability of the proposed brittleness indexes is validated by the collected datasets of uniaxial and triaxial compression tests results under different confinements for ten rock types. The results indicate that the values of two proposed indexes have positive correlations with confining pressure while have negative correlations with the rock brittleness. Finally, seven brittleness indexes are selected to further compare the rationality of the proposed brittleness indexes. The comparisons show that the results determined by the two brittleness indexes are different from other brittleness indexes while they can also describe the brittle characteristics of each rock types. The comparisons also prove either insufficient physical basis or inappropriate expression strategy in the existing brittleness indexes. Accordingly, the proposed methods for determining the rock brittleness seem to offer reliable evaluations of the rock brittleness in various rock types. This study provides a novel approach for quantitative evaluation of the rock brittleness, the results of which improve the existing methods and also enrich our understanding of the rock brittleness. Brittle Elsevier Energy-based brittleness index Elsevier Stress-strain curves Elsevier Energy dissipation Elsevier Rock failure Elsevier Tang, Huiming oth Wang, Yankun oth Ma, Junwei oth Enthalten in Elsevier Li, Xue ELSEVIER One-step solution-combustion synthesis of complex spinel titanate flake particles with enhanced lithium-storage properties 2015transfer abstract Amsterdam [u.a.] (DE-627)ELV013144928 volume:78 year:2020 pages:0 https://doi.org/10.1016/j.jngse.2020.103321 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 50.92 Meerestechnik VZ AR 78 2020 0 |
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10.1016/j.jngse.2020.103321 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001280.pica (DE-627)ELV050219391 (ELSEVIER)S1875-5100(20)30175-X DE-627 ger DE-627 rakwb eng 620 VZ 690 VZ 50.92 bkl Tao, Wen verfasserin aut Evaluation of methods for determining rock brittleness under compression 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Accurate assessment of brittleness of rock material is of great significance in the fields of underground mining engineering and unconventional oil and gas reservoirs. In this study, the existing methods for determining rock brittleness were reviewed in detail. Nevertheless, they encounter their own limitations in dealing with some special situations. Therefore, two brittleness indexes under compression are proposed based on energy evolution analysis in the complete process of deformation and failure of the rock. The proposed brittleness indexes consider the elastic strain energy and the dissipation energy before peak strength (PS) and the influence of post-peak stress drop. Then, the applicability of the proposed brittleness indexes is validated by the collected datasets of uniaxial and triaxial compression tests results under different confinements for ten rock types. The results indicate that the values of two proposed indexes have positive correlations with confining pressure while have negative correlations with the rock brittleness. Finally, seven brittleness indexes are selected to further compare the rationality of the proposed brittleness indexes. The comparisons show that the results determined by the two brittleness indexes are different from other brittleness indexes while they can also describe the brittle characteristics of each rock types. The comparisons also prove either insufficient physical basis or inappropriate expression strategy in the existing brittleness indexes. Accordingly, the proposed methods for determining the rock brittleness seem to offer reliable evaluations of the rock brittleness in various rock types. This study provides a novel approach for quantitative evaluation of the rock brittleness, the results of which improve the existing methods and also enrich our understanding of the rock brittleness. Accurate assessment of brittleness of rock material is of great significance in the fields of underground mining engineering and unconventional oil and gas reservoirs. In this study, the existing methods for determining rock brittleness were reviewed in detail. Nevertheless, they encounter their own limitations in dealing with some special situations. Therefore, two brittleness indexes under compression are proposed based on energy evolution analysis in the complete process of deformation and failure of the rock. The proposed brittleness indexes consider the elastic strain energy and the dissipation energy before peak strength (PS) and the influence of post-peak stress drop. Then, the applicability of the proposed brittleness indexes is validated by the collected datasets of uniaxial and triaxial compression tests results under different confinements for ten rock types. The results indicate that the values of two proposed indexes have positive correlations with confining pressure while have negative correlations with the rock brittleness. Finally, seven brittleness indexes are selected to further compare the rationality of the proposed brittleness indexes. The comparisons show that the results determined by the two brittleness indexes are different from other brittleness indexes while they can also describe the brittle characteristics of each rock types. The comparisons also prove either insufficient physical basis or inappropriate expression strategy in the existing brittleness indexes. Accordingly, the proposed methods for determining the rock brittleness seem to offer reliable evaluations of the rock brittleness in various rock types. This study provides a novel approach for quantitative evaluation of the rock brittleness, the results of which improve the existing methods and also enrich our understanding of the rock brittleness. Brittle Elsevier Energy-based brittleness index Elsevier Stress-strain curves Elsevier Energy dissipation Elsevier Rock failure Elsevier Tang, Huiming oth Wang, Yankun oth Ma, Junwei oth Enthalten in Elsevier Li, Xue ELSEVIER One-step solution-combustion synthesis of complex spinel titanate flake particles with enhanced lithium-storage properties 2015transfer abstract Amsterdam [u.a.] (DE-627)ELV013144928 volume:78 year:2020 pages:0 https://doi.org/10.1016/j.jngse.2020.103321 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 50.92 Meerestechnik VZ AR 78 2020 0 |
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Evaluation of methods for determining rock brittleness under compression |
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Accurate assessment of brittleness of rock material is of great significance in the fields of underground mining engineering and unconventional oil and gas reservoirs. In this study, the existing methods for determining rock brittleness were reviewed in detail. Nevertheless, they encounter their own limitations in dealing with some special situations. Therefore, two brittleness indexes under compression are proposed based on energy evolution analysis in the complete process of deformation and failure of the rock. The proposed brittleness indexes consider the elastic strain energy and the dissipation energy before peak strength (PS) and the influence of post-peak stress drop. Then, the applicability of the proposed brittleness indexes is validated by the collected datasets of uniaxial and triaxial compression tests results under different confinements for ten rock types. The results indicate that the values of two proposed indexes have positive correlations with confining pressure while have negative correlations with the rock brittleness. Finally, seven brittleness indexes are selected to further compare the rationality of the proposed brittleness indexes. The comparisons show that the results determined by the two brittleness indexes are different from other brittleness indexes while they can also describe the brittle characteristics of each rock types. The comparisons also prove either insufficient physical basis or inappropriate expression strategy in the existing brittleness indexes. Accordingly, the proposed methods for determining the rock brittleness seem to offer reliable evaluations of the rock brittleness in various rock types. This study provides a novel approach for quantitative evaluation of the rock brittleness, the results of which improve the existing methods and also enrich our understanding of the rock brittleness. |
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Accurate assessment of brittleness of rock material is of great significance in the fields of underground mining engineering and unconventional oil and gas reservoirs. In this study, the existing methods for determining rock brittleness were reviewed in detail. Nevertheless, they encounter their own limitations in dealing with some special situations. Therefore, two brittleness indexes under compression are proposed based on energy evolution analysis in the complete process of deformation and failure of the rock. The proposed brittleness indexes consider the elastic strain energy and the dissipation energy before peak strength (PS) and the influence of post-peak stress drop. Then, the applicability of the proposed brittleness indexes is validated by the collected datasets of uniaxial and triaxial compression tests results under different confinements for ten rock types. The results indicate that the values of two proposed indexes have positive correlations with confining pressure while have negative correlations with the rock brittleness. Finally, seven brittleness indexes are selected to further compare the rationality of the proposed brittleness indexes. The comparisons show that the results determined by the two brittleness indexes are different from other brittleness indexes while they can also describe the brittle characteristics of each rock types. The comparisons also prove either insufficient physical basis or inappropriate expression strategy in the existing brittleness indexes. Accordingly, the proposed methods for determining the rock brittleness seem to offer reliable evaluations of the rock brittleness in various rock types. This study provides a novel approach for quantitative evaluation of the rock brittleness, the results of which improve the existing methods and also enrich our understanding of the rock brittleness. |
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Accurate assessment of brittleness of rock material is of great significance in the fields of underground mining engineering and unconventional oil and gas reservoirs. In this study, the existing methods for determining rock brittleness were reviewed in detail. Nevertheless, they encounter their own limitations in dealing with some special situations. Therefore, two brittleness indexes under compression are proposed based on energy evolution analysis in the complete process of deformation and failure of the rock. The proposed brittleness indexes consider the elastic strain energy and the dissipation energy before peak strength (PS) and the influence of post-peak stress drop. Then, the applicability of the proposed brittleness indexes is validated by the collected datasets of uniaxial and triaxial compression tests results under different confinements for ten rock types. The results indicate that the values of two proposed indexes have positive correlations with confining pressure while have negative correlations with the rock brittleness. Finally, seven brittleness indexes are selected to further compare the rationality of the proposed brittleness indexes. The comparisons show that the results determined by the two brittleness indexes are different from other brittleness indexes while they can also describe the brittle characteristics of each rock types. The comparisons also prove either insufficient physical basis or inappropriate expression strategy in the existing brittleness indexes. Accordingly, the proposed methods for determining the rock brittleness seem to offer reliable evaluations of the rock brittleness in various rock types. This study provides a novel approach for quantitative evaluation of the rock brittleness, the results of which improve the existing methods and also enrich our understanding of the rock brittleness. |
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