This paper aims to study the influence of particle shape on the shear strength of superellipsoidal particles by Discrete Element Method (DEM) simulations of triaxial tests in 3D. A total of forty-nine types of equiaxed superellipsoidal particles from three evolution paths have been created. The definition of effective porosity has been proposed. Our findings show that both the particle sphericity and roundness affect the shear strength of the superellipsoidal particle system. Under the mutual impact of initial porosity and particle shape, the simulation results of shear strength and volumetric strains present a trend of initially decreasing and subsequently increasing. The microstructure evolution of superellipsoidal particles during the shearing process is observed microscopically. The anisotropy of fabric reveals the mechanism of effective porosity and sphericity influencing the macroscopic shear strength at the particle scale.

本文旨在通过离散元法 (DEM) 模拟 3D 三轴试验研究颗粒形状对超椭球体颗粒剪切强度的影响。共创建了来自三种演化路径的四十九种等轴超椭球粒子。已提出有效孔隙度的定义。我们的研究结果表明，粒子的球形度和圆度都会影响超椭球粒子系统的剪切强度。在初始孔隙率和颗粒形状的相互影响下，剪切强度和体积应变的模拟结果呈现先减小后增大的趋势。超椭球体颗粒在剪切过程中的微观结构演变是在显微镜下观察到的。