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Numerical Simulation of Direct Shear Test Using Elliptical Particles

机译：椭圆颗粒直接剪切试验的数值模拟

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This paper describes the results of numerical simulation of 2D assemblies of elliptical-shaped particles in direct shear test using discrete element method (DEM).The effects of vertical stress,eccentricity and aggregation on the macro behavior of granular materials in direct shear test are investigated.Assemblies of approximately 750 elliptical-shaped particles in random order represent soil specimens.DEM specimens are prepared at four vertical stresses (1,2,3 and 5Kg/cm2),six eccentricities (.01,.05,.1,.15,.2 and.25) and three aggregations.The results indicate that by increasing the vertical stress,volumetric strain and pick friction angle decrease.In addition,simulation results show that by increasing the eccentricity of particles in an assembly,vertical strain,mobilized angle atpick state and packing friction increase due to reaching their maximum value and then decrease.Furthermore,for well-graded assemblies with larger particles,maximum value of friction angle and strength were earned.
机译：本文介绍了离散元法（DEM）在直接剪切试验中对椭圆形颗粒二维组装的数值模拟结果，研究了垂直应力，偏心率和聚集对颗粒材料宏观剪切行为的影响。 。按随机顺序排列的大约750个椭圆形颗粒的集合代表土壤样本。在四个垂直应力（1,2,3和5Kg / cm2），六个偏心率（.01，.05，.1，.15）下制备DEM样本，.2和.25）和三个集合。结果表明，通过增加垂直应力，体积应变和拾取摩擦角会减小。此外，模拟结果表明，通过增加装配体中的粒子的偏心率，垂直应变可以移动角弹力状态和填料摩擦力由于达到最大值而先增大然后减小。此外，对于颗粒较大且渐变良好的装配体，最大的摩擦角和强度值应为恩。

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