预制双裂隙类岩材料断裂特性的无网格法数值模拟  

Application of element-free method to fracture analysis of rock-like materials with double prefabricated cracks

作　　者：刘京铄[1,2] 曹平[1] 范金星[2] 蒲成志[1] 黄雪姣[1] 

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083 [2]湖南水利水电职业技术学院,湖南长沙410131

出　　处：《铁道科学与工程学报》2016年第3期447-453,共7页Journal of Railway Science and Engineering

基　　金：国家自然科学基金重点资助项目(51174228;51274249);湖南省教育厅科技项目(14C0746)

摘　　要：在伺服控制单轴加载试验机上对预制两裂隙类岩试件进行压缩试验,观测试件的破坏模式及宏观裂纹的扩展路径。在简要阐述无网格法基本原理的基础上,将基于加权移动最小二乘法的无网格法应用于含裂隙类岩材料断裂特性的数值模拟,对含预制双裂隙类岩试件的断裂特性及其裂纹扩展路径进行数值计算与分析,给出裂尖应力场及位移场的变化关系,并将数值计算所得的裂纹扩展路径与实验结果进行比较,验证该方法的正确性与精确性。In order to investigate the failure mode and the crack expansion route, the compression test on rock -like specimens with two prefabricated cracks was carried out by utilizing the servo control uniaxial loading testmachine. Afterward, the fundamental theory of the element -free method is briefly illustrated. Then, the pro-posed method, which is based on the weighted moving least square approximation, is extended to numerical sire-ulation of fracture behavior of rock - like specimens with multiple cracks. Specifically, the fracture behavior andthe crack propagation path of rock -like specimens are numerically calculated and analyzed. At the same time,the curves of the stress and displacement fields at the tip of the fissures are obtained. Finally, the numerical so-lutions are compared with the available experimental results to verify the advantages, accuracy and availability ofelementfree method to fracture and discontinuous deformation problems. It is demonstrate that this method issuperior to other methods in terms of fracture analysis.

关 键 词：预制裂隙 类岩材料 单轴压缩 无网格法 数值分析 裂纹扩展 

分 类 号：TU45[建筑科学—岩土工程]