单轴压缩条件下含闭合双裂纹体岩石类材料的破坏机理  

Failure Mechanism of Rock Materials Containing Double Closed Cracks under Uniaxial Compression

作　　者：邵伟[1] 陈有亮[1] 周有成[1] 罗仁安[2] 

机构地区：[1]上海理工大学土木工程系,上海200093 [2]上海大学理学院,上海200444

出　　处：《上海大学学报（自然科学版）》2011年第2期216-220,共5页Journal of Shanghai University:Natural Science Edition

基　　金：国家自然科学基金资助项目(10872133);上海市浦江人才计划资助项目(09PJ1407700);上海市研究生创新基金资助项目(JWCXSU002)

摘　　要：在微型控制电液伺服单轴加载试验系统上,对含倾斜平行双裂纹的岩石类试件进行单轴加载试验研究,推导单轴压缩条件下试件应力强度因子(stress intensity factor,SIF)的解析表达式.分析裂纹表面摩擦系数对试件应力强度因子的影响,应用有限元法(finite element method,FEM)对同一问题进行数值分析,并与解析解进行比较.结果表明,随着裂纹表面摩擦系数的增大,应力强度因子减小,且采用有限元法求解应力强度因子是可行的,能准确预测含裂纹构件的安全性.此外,还对试件宏观裂纹的扩展机理进行了分析.Uniaxial loading tests of rock specimens with double parallel inclined closed cracks were conducted on a micro-controlled electro-hydraulic uniaxial loading system.The analytical expression of stress intensity factor（SIF） is derived in this paper.The influence of surface friction coefficient of crack on the stress intensity factor of specimens is analyzed.The process is studied using the finite element method（FEM） method,and the results compared with the analytical solution.The results show that SIF decreases with the increase of surface friction coefficient of crack.It is feasible to use FEM to solve stress intensity factor and the safety of containing crack component can be accurately predicted.In addition,the failure macro-mechanism of specimens is discussed.

关 键 词：单轴压缩 闭合裂纹 应力强度因子 摩擦系数 

分 类 号：O346.1[理学—固体力学]