突出煤相似材料单轴压缩的PFC2D模型细观参数标定研究

为了研究突出模拟相似材料单轴压缩颗粒流PFC2D模型宏细观参数之间的关系及对其细观参数进行标定,根据相似材料的配比构成及力学特征,以平行黏结模型作为颗粒接触的本构模型,在各细观参数影响因素分析的基础上,提出了试错法标定细观参数的宏观参数标准和具体流程,在相似材料的单轴压缩颗粒流模型细观参数标定中,通过赋予细观参数的数值模型计算得出的宏观参数、应力应变曲线和试件破坏特征均与室内物理试验结果相近。

Research on Calibration of Micro Parameters of PFC2D Model in Uniaxial Compression of Coal Similar Materials

To study the relationship between the macro and micro parameters of the PFC2D model and calibrate the micro parameters, according to the mechanical characteristics of the material, the parallel bond model is used as the constitutive model of the particle contact. Based on the analysis of the influencing factors of the micro parameters, the macro parameter standard and specific process of the trial and error method to calibrate the micro parameters are proposed. In the microscopic parameter calibration of uniaxial compressed particle flow model for similar materials, the macroscopic parameters, stress-strain curves and failure characteristics of the specimens calculated by the numerical model with microscopic parameters are similar to the results of laboratory physical tests.