裂隙水压力作用下岩体压剪裂纹的等效断裂判据探析  

Research on Equivalent Fracture Criterion of Compression-Shear Crack in Rocks under Fissure Water Pressure

作　　者：许晓亮[1] 胡鹏[1] 

机构地区：[1]三峡大学三峡库区教育部重点实验室

出　　处：《灾害与防治工程》2012年第2期33-38,共6页Disaster and Control Engineering

基　　金：基金项目：国家科学基金资助项目（90610029）;湖北省自然科学基金计划项目（2008CD366）.

摘　　要：许多情况下，岩体的断裂是一种压剪复合断裂，岩体裂纹的扩展和贯通都与岩石的破坏有着本质的联系。基于此，选取岩土体常用的Hoek-Brown和Mohr-Coulumb破坏准则。根据宏观等效原则，在分析已有H—B准则下的等效断裂判据的同时，导出了M—C破坏准则下的等效断裂判据。最后，在考虑了裂隙水压力的作用条件下，通过引入修正后的Ⅰ、Ⅱ型应力强度因子，分别导出了在裂隙水作用时，H-B和M—C破坏准则下的岩体压剪裂纹等效判据。In many cases, the fracture of rock mass is a compression-shear mixed mode. The expansion and transfixion of rock crack is essentially related with rock failure. So the Hoek-Brown and Mohr-Coulumb failure criterion commonly used in geotechnical engineering are selected. According to the macroscopic equivalent principle, while analyzing equivalent fracture criterion based on the H-B failure criterion, equivalent fracture criterion of the M-C failure criterion is derived. Finally, through introducing the revised Ⅰ、Ⅱ type stress intensity factor, and considering the fissure water pressure, equivalent fracture criterion of compression-shear fracture based on Hoek-Brown and Mohr-Coulomb criterion are derived respectively.

关 键 词：裂隙水压力 压剪裂纹 断裂判据 Hoek—Brown准则 Mohr—Coulumb准则 

分 类 号：TU459.1[建筑科学—岩土工程]