非连通预制节理试件力学特性试验研究  

Experimental research on mechanical properties of prefabricated disconnected joint samples

作　　者：段国勇 孙旭曙[3] 张景昱[3] DUAN Guoyong;SUN Xushu;ZHANG Jingyu(Key Laboratory of Ministry of Education for Geomechanics and Embank Engineering,Hohai University,Nanjing 210098,Jiangsu,China;Jiangsu Research Center for Geotechniacal Engineering Technology,Nanjing 210098,Jiangsu,China;College of Hydraulic & Environmental Engineering,China Three Gorges University,Yichang 443002,Hubei,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]江苏省岩土工程技术工程研究中心,江苏南京210098 [3]三峡大学水利与环境学院,湖北宜昌443002

出　　处：《河南理工大学学报（自然科学版）》2019年第5期152-158,共7页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(51279091,51439003);河海大学中央高校基本科研业务费项目(2016B43014);三峡库区地质灾害教育部重点实验室(三峡大学)开放基金资助项目(2015KDZ12)

摘　　要：为了研究节理几何特征的变化对岩石力学特性的影响,设计了具有不同节理连通率和不同节理倾角的试件,通过常规三轴压缩试验,分析了围压、节理倾角和节理连通率对试件强度以及变形和破坏特征的影响。岩样破坏形态分为穿越节理面的压剪破坏、沿节理面剪切滑动和节理端点处拉裂的混合破坏、完全沿节理面的剪切破坏。结果表明:围压、节理几何参数对试样的力学特性产生了不同程度的影响。通过节理参数的敏感性分析可以得出,节理倾角对试件强度的影响较节理连通率更为显著,节理连通率与破坏形态之间联系更为密切,围压对于试件承载力和变形参数值波动的影响较为明显。研究成果对认识非贯通节理岩体的力学特性有一定的参考作用。Sample of different joint connectivity rate and different joint inclination were designed to study the influence of changes in joint geometric features on rock mechanical properties.The effects of confining pressure,joint inclination and joint connectivity rate on the strength,deformation and failure characteristics of the samples were analyzed by conventional triaxial compression tests.Failure modes could be divided into shear compression failure which cut through the joint plane,mixing failure of shear sliding along the joint plane and pulling apart at joint endpoint,complete shear damage along the joint surface.The results showed that confining pressure and joint geometric parameters affected mechanical properties of the samples in different degrees.Sensitive analysis of the joint parameters demonstrated that the influence of joint angles on strength of the samples was more significant than that of the joint connectivity rate,while joint connectivity rate and failure mode were closely related,and the influence of confining pressure on the bearing capacity and deformation parameter fluctuation of the samples was obvious.The research achievements presented a reference for understanding the mechanical properties of disconnected jointed rock.

关 键 词：非连通节理 岩石力学 三轴试验 节理连通率 破坏模式 

分 类 号：TU45[建筑科学—岩土工程]