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共面闭合断续节理岩体直剪强度特性研究
引用本文:胡波,杨志荣,刘顺桂,王思敬,刘海宁.共面闭合断续节理岩体直剪强度特性研究[J].力学学报,2008,16(3):327-331.
作者姓名:胡波  杨志荣  刘顺桂  王思敬  刘海宁
作者单位:中国科学院工程地质力学重点实验室 北京 100029; 河北省唐海县交通局 唐海 063200; 江苏省交通科学研究院 南京 210017
基金项目:国家重点基础研究规划(973)资助项目(2002CB412702).
摘    要:介绍了节理面和岩桥各自的抗剪强度机制,引入法向变形协调条件,基于Mohr-Coulomb理论,推导了共面闭合断续节理岩体的直剪强度公式。模型试验发现,剪切破坏面以拉剪复合破坏为主,同时岩块中伴随大量的拉张微裂隙。试样的强度和变形具有明显的阶段性,全应力应变曲线主要经历了线弹性增长、节理面错动、次生裂纹起裂稳态扩展、节理面贯通破坏和残余强度5个阶段。对比发现,理论计算结果与试验值吻合较好。

关 键 词:断续节理  岩桥  直剪强度  破坏模式  全应力应变曲线
收稿时间:2007-06-20
修稿时间:2007-07-30

DIRECT SHEAR STRENGTH BEHAVIOR OF ROCK MASS CONTAINING COPLANAR CLOSE INTERMITTENT JOINTS
HU Bo,YANG Zhirong,LIU Shungui,WANG Sijing,LIU Haining.DIRECT SHEAR STRENGTH BEHAVIOR OF ROCK MASS CONTAINING COPLANAR CLOSE INTERMITTENT JOINTS[J].chinese journal of theoretical and applied mechanics,2008,16(3):327-331.
Authors:HU Bo  YANG Zhirong  LIU Shungui  WANG Sijing  LIU Haining
Institution:Key Lab of Engineering Geo-mechanics, Chinese Academy of Sciences, Beijing 100029; Traffic Bureau of Tanghai, Tanghai 063200; Jiangsu Transportation Research Institute, Nanjing 210017
Abstract:The shear strength mechanisms of joint and rock bridge are analyzed in this paper. Though introducing deformation compatibility equation in normal direction, the direct shear strength formulation is deducted based on the Mohr-Coulomb theory. According to the model test, tensile-shear complex failure is the main failure mode on the shear plane. Many tensile micro-cracks are formed in the test sample. There are five typical stages in the failure process. They are the linear elastic increment, the slippage of the joints, the steady development of post-cracking, the coalescence failure of discontinuous joints and the residual strength. The theoretical calculated results coincide well with experimental results.
Keywords:Intermittent joint  Rock bridge  Direct shear strength  Failure mode  Complete stress-strain curve  Rock mechanics
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