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Cracking behaviors and strength of rock-like samples with steps of different geometries under shear stress

Journal of Mountain Science 2021年第5期18卷 1352-1370页

作者： LE Hui-lin WEI Ji-hong SUN Shao-rui ZHANG Chu-chu Department of Geology Engineering Hohai UniversityNanjing 210098China China Energy Engineering Group Jiangsu Power Design Institute Co. Ltd.Nanjing 210098China

Steps are distinctive features for estimating the movement of the upper and lower block of ***,studies about the influence of steps as a special type of discontinuity on cracking behaviors and strength of rock masses are *** this research,rock-like samples with steps and preexisting flaws were *** height h and the inclination angle of gentle slope of the stepαwere set to different *** shear tests were conducted on these samples under different normal *** experimental results reveal that the inclination angle of the gentle slope of the stepα,step height h,and normal stress have an influence on the strength,crack initiation,and crack propagation of the *** experimental results show that crack behaviors and shear strength were affected by step inclination anglesαand step height *** the normal stress increases,the improvement of the strength of samples with a large step height is larger than that of samples with a small step height,the improvement of the strength of samples withαof 10°is larger than that of samples withαof 0°and-10°.The discrete element method was used to simulate the shear *** results show five different types of displacement vectors,which can be used to determine whether the cracks are tensile cracks or shear *** above conclusions can provide help for estimating mechanical properties and failure modes of rock masses with steps of different geometries.

关键词： Step preexisting flaw Direct shear test Crack behavior Shear stress Numerical test

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