工程地质学报2023，Vol.31Issue(6)：1872-1880,9.DOI:10.13544/j.cnki.jeg.2021-0667
含Z型相交裂隙岩体剪切力学行为研究
SHEAR MECHANICAL BEHAVIOR OF ROCK MASS CONTAINING Z-TYPE INTERSECTING FRACTURES WITH LABORATORY TEST
摘要
Abstract
We aim to investigate the shear mechanical behavior of rock mass containing fractures.We cut the lime-stone samples with Z-type intersecting fractures by water knife,and carry out the laboratory direct shear tests.We examine the shear stress-displacement curve,analyze the influence of prefabricated fissure angle and normal pres-sure on the strength,deformation and crack coalescence and explore the failure evolution mechanism.The results indicate the follows:(1)The shear stress-displacement curve can be divided into four deformation and failure stages including prefabricated fracture and pore compaction stage(initial sag),quasi-linear deformation stage(intermediate linear fluctuation),pre-peak unstable fracture development stage(later convex)and post-peak strength residual stage(steep drop).(2)The peak shear stress of specimens increases with the normal stress at the same fissure angle(nearly linear)and decreases with the increase of fissure angle at the same normal pressure(the trend is slowing down).(3)The evolution of macroscopic crack damage can be divided into three stages,including initial compres-sion elastic stage,crack growth stage and through fracture failure stage.The failure modes can be divided into three types,i.e.,tensile failure,shear failure and tension-shear mixed failure.The last one can be divided into two types,i.e.,tension-shear hole-through and shear-stretch-shear hole-through.关键词
Z型相交裂隙/直接剪切/力学特性/裂隙倾角/裂纹扩展/破坏模式Key words
Z-type intersecting fractures/Direct shear/Mechanical properties/Fissure angle/Crack coales-cence/Failure mode分类
建筑与水利引用本文复制引用
刘新荣,刘馨琳,许彬,王子娟,曾夕,陈欣..含Z型相交裂隙岩体剪切力学行为研究[J].工程地质学报,2023,31(6):1872-1880,9.基金项目
国家自然科学基金项目(资助号:41972266),中国博士后科学基金项目(资助号:2023M730432),重庆市研究生科研创新项目(资助号:CYS21024,CYS21029),2018年重庆市基础研究与前沿探索项目(资助号:cstc2018jcyjAX0453).This research is supported by the National Natural Science Foundation of China(Grant No.41972266),the China Postdoctoral Science Foundation(Grant No.2023M730432),the Graduate Scientific Research and Innovation Foundation of Chongqing,China(Grant Nos.CYS21024,CYS21029)and Basic Research and Frontier Exploration Project of Chongqing in 2018(Grant No.cstc2018jcyjAX0453). （资助号:41972266）
