破坏单元消去法在岩石非线性断裂研究中的应用  

Application of Failure Element Deleting Method to Non-linear Rock Fracture Study

作　　者：赵吉坤[1] 韩美贵[1] 

机构地区：[1]南京农业大学工学院,江苏南京210031

出　　处：《水力发电》2009年第7期24-27,共4页Water Power

基　　金：国家自然科学基金资助项目(50379004);南农大工学院引进人才基金资助项目(RCQD08-02)

摘　　要：提出破坏单元网格消去法模拟裂纹扩展,将细观单元损伤度的值作为判断其损伤破坏依据,利用高性能并行计算实现岩石三维破裂过程的数值模拟。对岩石试样I型裂纹的破坏过程进行数值模拟,研究高边坡岩体滑坡破坏问题,给出裂纹萌生、扩展过程及破坏形态,分析细观非均匀性对岩石宏观破裂力学行为的影响。结果表明,岩石I型裂纹仿真试验和物理试验得到的极限强度吻合较好,高边坡岩体滑坡破坏数值试验和实地观测水平位移吻合较好,说明破坏单元消去法能够清晰直观地模拟岩石非线性破裂过程。The failure elements deleting method is put forward to simulate the crack extension, to judge the failure basis of damage by microscopic element damage degree. The numerical simulation of 3D crack process of rock was realized by high performance calculation. The failure process of rock with mode-I crack is numerically simulated to study on the slide failure of rock in the high slope and to give the crack initiation, propagation and failure shapes. Then the influence of microscopic heterogeneity on rock macroscopic failure mechanical behaviors was analyzed. The results showed the limiting strength gained by the simulation and physical tests of rock crack accord with each other well, and the numerical test on the slide failure of the rock in bigh slope agrees with the observed horizontal displacement, which illuminates the failure elements deleting method can intuitively and clearly simulate non-linear crack process of rock.

关 键 词：岩石力学 数值模拟 弹塑性损伤 破坏单元网格消去法 细观破裂过程 

分 类 号：TU452[建筑科学—岩土工程]