Micro-mechanical characteristics and cracks revolution laws of migmatitic granite under different loading conditions

作者：Miao Shengjun^*; Yang Zhijun; Long Chao; Ren Fenhua

来源：Journal of Jiangsu University(Natural Science Edition), 2012, 33(4): 469-473.

DOI：10.3969/j.issn.1671-7775.2012.04.019

• Different confining pressures
• Laboratory experiments
• Loading codes
• Loading condition
• Mechanical characteristics
• Micro-mechanical
• Particle flow
• Particle flow theories
• Physical and mechanical parameters
• Rock grains
• Triaxial compression
• Uni-axial compression

According to the physical and mechanical parameters from laboratory experiments and the grains section scanning, micro-geometric model and micro-mechanical 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 stress-strain curves, acoustic emission and "Crack" monitoring results from laboratory and PFC numerical simulation, the micro-mechanical 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 micro-mechanical characteristics and kinematic behaviors of rock grains under different loading conditions.

• 出版日期2012
• 单位北京科技大学