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为了研究颗粒棱角对颗粒材料力学行为的影响,建立了具有不同棱角度的对称多面体颗粒,采用了一种简单并适合任意颗粒形状的接触本构模型,对三维离散元开源程序YADE进行了修改,研究了颗粒棱角度在模拟直剪试验中的影响以及接触力各向异性在剪切过程中的演化规律。研究结果表明,颗粒棱角度越小,颗粒间相互咬合自锁的作用越小,颗粒受剪更易转动,致使颗粒体系的剪切强度和剪胀性下降;竖向加载力越大,颗粒棱角度的影响越明显;法向接触力的各向异性在剪切过程中表现为先增后减最后趋向稳定的趋势;法向接触力的各向异性变化程度随颗粒棱角度的增大而增大。
In order to study the effect of grain edge angle on the mechanical behavior of granular materials, a symmetrical polyhedral particle with different angular degrees was established. A simple and suitable contact constitutive model with arbitrary particle shape was adopted to modify the open source program YADE, The influence of particle edge angle in the simulation of direct shear test and the evolution of contact force anisotropy in the shear process were studied. The results show that the smaller the angularity of the particles, the smaller the interaction between the particles is, the easier the particles are sheared when shearing, which leads to the decrease of the shear strength and dilatancy of the particle system. The larger the vertical loading force, The anisotropy of the normal contact force shows the trend of increasing firstly and then decreasing and finally stabilizing in the process of shearing; the degree of anisotropic change of the normal contact force increases with the increase of the grain edge angle .