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

作     者：LE Hui-lin WEI Ji-hong SUN Shao-rui ZHANG Chu-chu LE Hui-lin;WEI Ji-hong;SUN Shao-rui;ZHANG Chu-chu

作者机构：Department of Geology EngineeringHohai UniversityNanjing 210098China China Energy Engineering Group Jiangsu Power Design Institute Co.Ltd.Nanjing 210098China 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2021年第18卷第5期

页      面：1352-1370页

核心收录：

学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：National Natural Science Foundation of China(No.42007256 and 41672258) the Fundamental Research Funds for the Central Universities(B210201002) 

主　　题：Step Preexisting flaw Direct shear test Crack behavior Shear stress Numerical test 

摘      要：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.