江淮水利科技Issue(6)：1-8,14,9.DOI:10.20011/j.cnki.JHWR.202506001
水-力耦合作用下泥质充填节理岩体剪切力学特性试验研究
Experimental study on the shear mechanical properties of mud-filled jointed rock masses under hydro-mechanical coupling
摘要
Abstract
In order to explore the evolution law of shear behavior of filling argillaceous jointed rock mass under the action of hydro-mechanical coupling,taking the F2 fault rock mass of Xianghongdian reservoir as the research object,the rock triaxial test system device was used to carry out the shear test of filling jointed rock mass with different water content under the confining pressure of 0.4,0.7,1.0,1.3 MPa,and the joint failure surface and fault mud of rock mass were analyzed by electron microscope scanning.The results showed that:1)With the increase of confining pressure,the shear strength of clay-filled joint samples showed an increasing trend,and the shear hardening behavior was more significant under high confining pressure;2)With the increase of confining pressure,the friction coefficient of the low moisture content sample(S1,w=10%)increases rapidly,the friction coefficient of the medium moisture content sample(S2,w=40%)increased slowly,and the friction coefficient of the high moisture content sample(S3,w=70%)increased most slowly;3)With the increase of water content(10%→40%→70%),the internal friction angle showed a non-linear downward trend(35°→8°→10°),and the cohesion showed the characteristics of first increase and then decrease(0.05→0.13→0.06 MPa);4)Comparing the scanning data of S1 and S3 samples before and after 1.3 MPa,it could be found that the surface roughness of the fault had changed significantly after shear slip,and the fault slip behavior of rock particle size was obviously different due to the low/high water content fault gouge;5)Through scanning electron microscopy,it could be seen that with the increase of water content of fault gouge,the microstructure of fault gouge changed from local fault to overall fault.The research results had certain reference value for the evolution law of shear behavior of filling argillaceous jointed rock mass under hydraulic coupling.关键词
断层/充填节理/含水率/围压/剪切试验/微观结构Key words
fault/filled joints/water content/confining pressure/shear test/microstructure分类
建筑与水利引用本文复制引用
张今阳,罗居刚,王硕..水-力耦合作用下泥质充填节理岩体剪切力学特性试验研究[J].江淮水利科技,2025,(6):1-8,14,9.基金项目
安徽省自然科学基金水联合基金项目(2308085US02) （2308085US02）
