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用DEM数值计算了一个颗粒介质的双轴压缩试验,分析了颗粒介质在等向压缩与剪切过程中颗粒细观结构的变化规律,推导出一个基于颗粒细观结构变化的颗粒介质屈服函数,其形式与修正剑桥模型的屈服面相似.利用该屈服面方程,可以通过颗粒接点数按接触角整理的分布变化说明在压缩和剪切过程中颗粒介质的屈服特性,为从颗粒细观结构的变化规律进一步研究颗粒介质的应力-应变特性提供了一个可行的方法.
The biaxial compression test of a granular medium was calculated by DEM. The variation of the microstructure of the granular medium in the process of isotropic compression and shearing was analyzed. A yield function of the granular medium based on the change of the microstructure was deduced. Its form is similar to that of the modified Cambridge model.Using this yield surface equation, the yield characteristics of the granular media during compression and shearing can be described by the distribution of the number of contact points by the number of particles, The law of variation provides a feasible method to further study the stress-strain characteristics of granular media.