多组非贯通裂隙岩石的压缩特性数值研究  

Numerical Simulation of Rocks Containing Multiple Sets of Non-persistent Joints

作　　者：杨善统 李瑶[1,2] 姚池[3] 张小波[1] 

机构地区：[1]武汉大学土木建筑工程学院,武汉430072 [2]中铁第四勘察设计院集团有限公司,武汉430063 [3]南昌大学建筑工程学院,南昌330031

出　　处：《科学技术与工程》2015年第17期85-90,共6页Science Technology and Engineering

基　　金：江西省教育厅研究项目(14158);国家自然科学基金项目(51409138)资助

摘　　要：裂隙岩体力学性质研究是非常复杂的课题,非贯通裂隙岩石的力学行为与裂隙的几何产状密切相关,裂纹的扩展贯通直接影响岩石的破坏。采用改进刚体弹簧方法,以随机均布Voronoi图为基础,生成不同裂隙产状的岩石数值模型,模拟含多组非贯通裂隙岩石的细观起裂和扩展过程。从细观和宏观两个方面分析了预制裂隙的贯通模式及其对岩石宏观破坏模式的影响;并得到沿平面破坏、阶梯状破坏、沿次生块体转动破坏三种破坏模式。通过分析岩石渐进破坏过程揭示其破坏机理;且定量分析了裂隙岩石在强度上表现出的各向异性特征。将数值计算结果与已有的岩石试验结果对比分析,表明数值与试验结果吻合较好。The properties of jointed rock mass are very complicated. The mechanical behaviour of non-persistent jointed rock is closely related to the geometry of rock, and the initiation and propagation of the cracks has direct effect on the failure of the rock. To simulate the initiation and propagation of micro cracks, basing on random equis- paced Voronoi diagram, a modified rigid body spring method （RBSM） was used to generate different rock numerical models. The coalescence pattern of pre-existing flaws and failure mode of rock were analysed in both aspects of me- soscopic and macroscopic, test results showed three basic failure modes, i.e. failure through a planar surface, stepped failure and failure by rotation of new blocks. Meanwhile, analysis of rock progressive failure process reveals rock failure mechanism and the anisotropic characteristics of uniaxial compressive strength were discussed. Compar- ison with former experimental studies showed that both strength and deformation results analyzed by the numerical simulation are in good agreement with the experiment data.

关 键 词：非贯通裂隙 改进刚体弹簧方法 数值模拟 破坏模式 各向异性 

分 类 号：TU452[建筑科学—岩土工程]