PFC^(2D)数值计算模型微观参数确定方法

Method to Determine Microscopic Parameters of PFC^(2D) Numerical Model

针对目前应用"试错法"来确定PFC2D数值计算模型微观参数所存在的盲目性问题,提出一种基于物理试验响应的参数确定方法.通过模拟具体对象的基本特性计算模型物理几何参数,借助物理试验响应反演计算颗粒间的接触本构参数.以焦家金矿-450中段下盘糜棱岩为例,在单轴抗压物理试验的基础上,确定相应的数值计算模型微观参数并进行单轴、双轴模拟试验,模拟结果与物理试验具有良好的一致性,验证了微观参数确定方法的可靠性和适用性.PFC2D微观参数确定方法能够在保证精确模拟的基础上,大大降低前期建模工作量,为类似研究提供借鉴.

Due to the blindness of the current ＂trial and error method＂used in determining the microscopic parameters in the PFC2 D,a microscopic parameters determination method was put forward based on physical experiments. The physical and geometrical parameters of the simulation model were obtained by simulating the basic characteristics of real samples,and the contact constitutive parameters between particles were back calculated base on the physical test responses.Taking the mylonite of-450 level footwall in Jiaojia gold mine as an example, the micro parameters of the corresponding numerical model were determined,and uniaxial and biaxial simulation were carried out based on the uniaxial compressive physical test. The simulation results and physical responses have good consistency,which verifies the reliability and applicability of the proposed method. The PFC2 Dmicrocosmic parameters determination method can ensure simulation accuracy,reduce the early modeling workload and offer references for similar researches.