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基于PFC的堆石料宏细观参数相关性分析

杨杰,韩孝峰   

  • 出版日期:2018-08-28 发布日期:2018-08-28

Correlation analysis on macroscopic and mesoscopic parameters of rockfill material based on PFC

YANG Jie, HAN Xiaofeng   

  • Online:2018-08-28 Published:2018-08-28

摘要: 通过一系列PFC数值试验,对堆石料颗粒细观参数与材料宏观参数之间相关性进行了分析,建立了颗粒摩擦系数f与材料摩擦角φ之间的关系,材料初始弹性模量Ec、泊松比γ与颗粒接触刚度kn,ks之间的关系,以及材料单轴抗压强度P0与颗粒簇内基本颗粒间粘结强度bn之间的关系。通过对一系列颗粒细观参数与宏观参数之间关系的分析,选定了采用PFC模拟堆石料试验时细观参数的确定方法,并分析了岩土试验中室内试验结果与PFC模拟结果之间的差别及其原因。

关键词: 堆石料, 颗粒流, 宏观参数, 细观参数, 颗粒破碎

Abstract: Through a series of PFC numerical tests, the correlation of mesoscopic and macroscopic parameters of rockfill materials are analyzed. Three relationships are established: friction angle of particle and friction coefficient of rockfill material, initial elastic modulus, Poisson's ratio and grain contact stiffness(kn, ks), uniaxial compressive strength(P0) and the particle clusters(bn). Through analyzing the relations between mesoscopic parameters and macroscopic parameters, we proposed a method to determine the mesoscopic parameters in the PFC simulation test of rockfill material. The differences between laboratory test results and PFC simulation results and the causes are analyzed.

Key words: rockfill, PFC, macroscopic parameters, mesoscopic parameters, grain crushing