A shear brittleness index for rock joints and its application in direct shear failure analysis
The brittle shear failure of rock mass structural planes is an important cause of structure-controlled rockburst, which severely threatens the safety construction of deep rock engineering. Quantifying the brittleness of the shear process of rock mass structural planes is of great significance for ev...
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Elsevier
2025-09-01
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| Series: | Results in Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123025028919 |
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| author | Sheng Li Pengxian Fan Ziming Xiong Qiliang Yang Haozhe Xing Haiming Jiang |
| author_facet | Sheng Li Pengxian Fan Ziming Xiong Qiliang Yang Haozhe Xing Haiming Jiang |
| author_sort | Sheng Li |
| collection | DOAJ |
| description | The brittle shear failure of rock mass structural planes is an important cause of structure-controlled rockburst, which severely threatens the safety construction of deep rock engineering. Quantifying the brittleness of the shear process of rock mass structural planes is of great significance for evaluating the disaster-causing tendency of jointed rock. However, quantitative analyses of shear deformation brittleness of rock mass structural planes remain scarce. Based on the analysis of typical shear stress-shear displacement curves, an innovative shear brittleness evaluation index was constructed. The proposed index comprehensively couples pre-peak shear deformation stiffness, post-peak stress drop and deformation characteristics and provides a scientific metric to quantitatively evaluate the brittleness of the shear deformation process of rock mass structural planes. Direct shear tests under different normal stress conditions were conducted on regular toothed structural planes of sandstone. The brittleness of shear deformation curves was quantitatively analyzed using the proposed shear brittleness index, revealing the effects of asperity angle and normal stress on shear brittleness. Analytical results show that the proposed index can reasonably characterize the brittleness of shear deformation of rock mass structural planes. The determination of parameters is discussed, and objective and reliable methods are recommended for selecting the required process parameters. The proposed shear brittleness index serves as a tool for the objective and quantitative evaluation of brittleness during the shear process of rock mass structural planes. It holds significant application value for the prevention of engineering and geological disasters induced by shear instability of rock mass structural planes. |
| format | Article |
| id | doaj-art-e06ba71149954504be80b3c8b222aa6e |
| institution | Kabale University |
| issn | 2590-1230 |
| language | English |
| publishDate | 2025-09-01 |
| publisher | Elsevier |
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| series | Results in Engineering |
| spelling | doaj-art-e06ba71149954504be80b3c8b222aa6e2025-08-23T04:49:03ZengElsevierResults in Engineering2590-12302025-09-012710682710.1016/j.rineng.2025.106827A shear brittleness index for rock joints and its application in direct shear failure analysisSheng Li0Pengxian Fan1Ziming Xiong2Qiliang Yang3Haozhe Xing4Haiming Jiang5State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing, Jiangsu 210007, ChinaCorresponding author.; State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing, Jiangsu 210007, ChinaState Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing, Jiangsu 210007, ChinaState Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing, Jiangsu 210007, ChinaState Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing, Jiangsu 210007, ChinaState Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing, Jiangsu 210007, ChinaThe brittle shear failure of rock mass structural planes is an important cause of structure-controlled rockburst, which severely threatens the safety construction of deep rock engineering. Quantifying the brittleness of the shear process of rock mass structural planes is of great significance for evaluating the disaster-causing tendency of jointed rock. However, quantitative analyses of shear deformation brittleness of rock mass structural planes remain scarce. Based on the analysis of typical shear stress-shear displacement curves, an innovative shear brittleness evaluation index was constructed. The proposed index comprehensively couples pre-peak shear deformation stiffness, post-peak stress drop and deformation characteristics and provides a scientific metric to quantitatively evaluate the brittleness of the shear deformation process of rock mass structural planes. Direct shear tests under different normal stress conditions were conducted on regular toothed structural planes of sandstone. The brittleness of shear deformation curves was quantitatively analyzed using the proposed shear brittleness index, revealing the effects of asperity angle and normal stress on shear brittleness. Analytical results show that the proposed index can reasonably characterize the brittleness of shear deformation of rock mass structural planes. The determination of parameters is discussed, and objective and reliable methods are recommended for selecting the required process parameters. The proposed shear brittleness index serves as a tool for the objective and quantitative evaluation of brittleness during the shear process of rock mass structural planes. It holds significant application value for the prevention of engineering and geological disasters induced by shear instability of rock mass structural planes.http://www.sciencedirect.com/science/article/pii/S2590123025028919Rock jointShear brittleness indexDirect shear testShear stress-shear displacement curve |
| spellingShingle | Sheng Li Pengxian Fan Ziming Xiong Qiliang Yang Haozhe Xing Haiming Jiang A shear brittleness index for rock joints and its application in direct shear failure analysis Results in Engineering Rock joint Shear brittleness index Direct shear test Shear stress-shear displacement curve |
| title | A shear brittleness index for rock joints and its application in direct shear failure analysis |
| title_full | A shear brittleness index for rock joints and its application in direct shear failure analysis |
| title_fullStr | A shear brittleness index for rock joints and its application in direct shear failure analysis |
| title_full_unstemmed | A shear brittleness index for rock joints and its application in direct shear failure analysis |
| title_short | A shear brittleness index for rock joints and its application in direct shear failure analysis |
| title_sort | shear brittleness index for rock joints and its application in direct shear failure analysis |
| topic | Rock joint Shear brittleness index Direct shear test Shear stress-shear displacement curve |
| url | http://www.sciencedirect.com/science/article/pii/S2590123025028919 |
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