Numerical Analysis of Fracture Behavior of Multiple Cracks in Rock

4th International Conference on Energy Equipment Science and Engineering

Yuelin, Sun^1 ; Jianfeng, Xue^2 ; Zhenzhong, Shen^3

China Institute of Water Resources and Hydropower Research, Beijing

100038, China^1

China Renewable Energy Engineering Institute, Beijing

100120, China^2

Hohai University, Nanjing

210098, China^3

关键词: Crack branching;    Cracks propagation;    Element-free method;    Fracture behavior;    Interaction mechanisms;    Multiple crack;    Propagation process;    Theory of fracture mechanics;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/242/5/052063/pdf
DOI  :  10.1088/1755-1315/242/5/052063

来源: IOP

【 摘 要 】

Interaction between multiple cracks in rock mass makes the propagation process more different than that of a single crack. In the paper, the criteria of maximum circumferential shear stress was proposed to describe the crack branching and the rock bridge fracture between multiple cracks in experiment. Based on the theory of fracture mechanics, the process of multi-cracks propagation and connection was traced by element-free methods (EFM). The crack branching in experiment was simulated including the wing cracks appeared in initial cracking stage and the shear cracks in crack propagation stage. By contrasted with the single-crack model, the interaction mechanism in multiple cracks and its effect on cracks propagation and connection was analyzed. The results show that rock bridge fracture can be caused by the propagation and connection of shear cracks instead of initial wing cracks.