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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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
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| Series: | Results in Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123025028919 |
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| Summary: | 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. |
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| ISSN: | 2590-1230 |