Fracture analysis of rock mass based on 3-D nonlinear Finite Element Method

作     者：LIU YaoRu CHANG Qiang YANG Qiang WANG ChuanQi GUAN FuHai 

作者机构：State Key Laboratory of Hydroscience and Hydraulic Engineering Tsinghua University Beijing 100084 China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2011年第54卷第3期

页      面：556-564页

核心收录：

学科分类：0810[工学-信息与通信工程] 081504[工学-水利水电工程] 08[工学] 0815[工学-水利工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 080102[工学-固体力学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China (Grant No. 50709014) China National Funds for Distinguished Young Scientists (Grant No. 50925931) State Key Laboratory of Hydroscience and Engineering of China (Grant No. 2008-TC-2) 

主　　题：三维非线性 非线性有限元方法 断裂分析 有限元分析模型 不平衡力 岩体 应力强度因子 裂缝延伸 

摘      要：Traditional fracture analysis is based on fracture mechanics and damage mechanics. They focus on the propagation of the fracture. However, their propagation criterions are not easily applied in practice and the current analysis is limited in planar problem. This paper presents a new theory that the occurrence of the unbalanced force (derived from the Deformation Reinforcement Theory) could be the criterion of the initiation of the fracture, and the distribution area and propagation of the unbalanced force could be the indication of the fracture propagation direction. By aggregate analysis with Stress Intensity Factor (SIF) criterion, the unbalanced force actually is the opposite external load that is the SIF difference incurred between the external loads and permitted by the structure. Numerical simulation and physical experiments on pre-fracture cuboid rock specimens proved that the occurrence of the unbalanced force could be the initiation of the fracture. Mesh size dependence was also considered by analysis of different mesh size finite element gravity dam models. Furthermore, the theory was applied to the feasibility analysis of the Baihetan arch dam together with physical experiments in order to evaluate the fracture propagation of dam heel. The results show that it is an effective way to use unbalanced force to analyze the fracture initiation and propagation when performing 3-dimensional nonlinear FEM calculation.