Micro-mechanical characteristics and cracks revolution laws of migmatitic granite under different loading conditions
1.State Key Laboratory of the Ministry of Education of China for HighEfficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China; 2.School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; 3.China Railway Resources Group Limited Company, Beijing 100039, China
Abstract： According to the physical and mechanical parameters from laboratory experiments and the grains section scanning, microgeometric model and micromechanical parameters of migmatitic granite grains were built based on particle flow theory and PFC programs. Loading codes were developed, and some functions were adjusted by Fish language to simulate uniaxial and triaxial compression experiments. Based on comprehensive comparison and analysis of stressstrain curves, acoustic emission and “Crack” monitoring results from laboratory and PFC numerical simulation, the micromechanical characteristics and the cracks revolution laws from microcosm to macrocosm of migmatitic granite from -45 m level of Xingshan Iron Mine were obtained under different loading conditions. According to the comparison of simulation results of rock uniaxial compression and triaxial compression at different confining pressures with laboratory experiments, PFC can accurately simulate the micromechanical characteristics and kinematic behaviors of rock grains under different loading conditions.
2012, Vol. 33 
