中文摘要：

根据室内试验获得的岩石宏观物理力学参数及岩样切片扫描图,基于颗粒流理论和PFC程序建立混合花岗岩颗粒细观几何模型,标定模型材料细观力学参数,采用Fish语言编制加载命令流并调整相应函数,对岩石单轴和三轴压缩试验进行模拟.通过对试验与模拟应力-应变曲线、AE声发射与PFC程序中＂Crack＂裂纹监测成果等的综合比较研究,获得荷载作用下杏山铁矿-45 m水平混合花岗岩细观力学特性、微破裂行为以及岩石微裂隙发展与宏观破裂演化规律.通过对混合花岗岩单轴和不同围压下三轴压缩PFC模拟曲线与室内试验结果的比较可知,PFC模拟能准确地表征荷载下岩石颗粒的细观力学特性和运动学行为.

英文摘要：

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.