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以杏山铁矿-45水平为工程研究背景,运用颗粒流理论,建立了片麻岩颗粒流数值模型;在分析区域岩体粒径分布规律和岩石物理力学特性的基础上,进行了PFC模型参数对宏观参数的敏感度分析,确定合理的模型输入参数;采用PFC2D程序,对片麻岩的单轴压缩试验进行了数值模拟。将模拟结果与室内试验结果进行对比,借助声发射技术,分析单轴压缩试验中岩石从微观裂纹到宏观破裂的演化过程,获得单轴压缩条件下岩石破裂的演化规律及破裂模式。研究结果对完善岩体的本构模型具有一定参考价值。
Based on the research background of -45 level in Xingshan iron mine, the particle flow theory is used to establish the numerical model of gneiss flow. On the basis of analyzing the distribution rules of rock mass size and the physical and mechanical characteristics of rock, PFC model Parameter sensitivity analysis of macro parameters to determine a reasonable model input parameters; using PFC2D program, the gneiss rock uniaxial compression test numerical simulation. The simulation results are compared with the indoor test results. With the aid of acoustic emission technique, the evolution of rock from microcracks to macroscopic fractures in uniaxial compression tests is analyzed. The evolution and rupture pattern of rock failure under uniaxial compression are obtained. The research results have some reference value to improve the constitutive model of rock mass.