Damage evolution and numerical simulation of tension fracture of rock
In order to study the relation between the microscopic structure evolution and the macroscopic failure of the rock on the situation of the loading, according to the different character of the rock deformation, it considers the damage accumulation character and the fracture of the rock. Aiming at the fracture and the pore existing in the rock itself, it simulates the micro-cracks of the rock itself using the Weibull distribution of the rock material to produce the finite element program, introduces the concept of the damage degree, simulates the damage evolution degree of the rock inner in the process of loading. Based on the theory of rock tension damage, it gives the criterion of the rock tension damage, simulates the evolution process of the rock crack producing the finite element program. Taking the Brazalian pan experiment as example, it simulates the rock evolution process of the damage and the tension fracture. The damage evolution process result shows that in the initial loading stage the rock particles squeeze and press, as the load increases gradually the micro pore and cracks make the stress concentrate, the damage degree gradually increases and the ability to resist deformation decreases. After the load exceeds stress limit, the connection of micro crackles develops into macro breaking plane, thus entering destabilizing breakage stage. The tension fracture result shows that because the rock tensile strength is low the fracture will form discontinuous surface; the stress distribution changes around rock crackle, partial stress is released, new stress concentration is formed and stress is transferred. Through the analysis, it can provide the theoretical basis for studying the crack extending and evolution law of the rock and forecasting and predicting the instability failure of the rock system.
Laigui WANG Na ZHAO Yongfa ZHOU
College of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, China China Designing Institute of Electronic Engineering, Beijing 100840, China
国际会议
香港
英文
1-4
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）