岩石类非均质脆性材料破坏过程的数值模拟  

NUMERICAL SIMULATION OF FRACTURE PROPAGATION OF ANISOTROPIC ROCK-LIKE MATERIALS

作　　者：张德海[1] 朱浮声[1] 邢纪波[2] 杨顺存[3] 

机构地区：[1]东北大学土木工程系,辽宁沈阳110004 [2]烟台大学土木工程系,山东烟台264005 [3]河海大学土木工程学院,江苏南京210098

出　　处：《岩石力学与工程学报》2005年第4期570-574,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(10072053);东北大学优秀博士论文基金项目

摘　　要：用梁–颗粒模型BPM2模拟了岩石的破坏过程。梁–颗粒模型是在离散单元法基础上,结合有限单元法提出的用于模拟岩石类材料破坏过程的数值模型。在模型中,采用3种类型梁单元随机分布来模拟岩石类材料力学参数的空间变异性,并通过自动生成的非均质材料模型对岩石类材料的破坏机理进行了研究。岩石类非均质脆性材料在单轴受压状态下破坏过程细观数值模拟结果显示,岩石材料宏观破坏是由于其内部细观裂纹产生、扩展、贯通的结果。与实际矿柱破坏形态的对比分析表明,梁–颗粒模型是计算和模拟岩石类脆性材料破坏问题的有力工具。The beam-particle model (BPM2) is used to model fracturing behavior of rocks. This numerical method used simulating damage and fragmentation phenomena of rock-like materials is presented on the basis of discrete element method (DEM) and lattice model. Random distribution of three types of beams in BPM is employed to simulate the spatial variation of mechanical parameters of brittle rock-like materials. The model of anisotropic media is generated automatically and used to investigate the mechanical behaviors of these low-porosity materials. The numerical simulation results of fracturing process in anisotropic brittle rock-like materials under uniaxial compression show that the initiation, propagation and linking of the fractures in the rock samples at mesoscale level produce the macro-failure of rock samples. The comparison with failure modes of pillars in underground mines proves this method is appropriate and efficient for simulating fracture propagation of anisotropic rock-like materials.

关 键 词：岩石力学 非均质材料 数值模拟 梁-颗粒模型 破坏过程 

分 类 号：TU451[建筑科学—岩土工程]