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Numerical Simulation of Direct Shear Test Using Elliptical Particles

机译：使用椭圆粒子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：本文研究了使用离散元素法（DEM）在直接剪切试验中的椭圆形颗粒中的2D组件数值模拟的结果。研究了垂直应力，偏心和聚集在直接剪切试验中颗粒材料宏观行为的影响。随机顺序大约750个椭圆形颗粒代表土壤标本。在四个垂直应力（1,2,3和5kg / cm2），六种偏心（.01，.05，.1，.15 ，.2和.25）和三个聚合。结果表明，通过增加垂直应力，体积应变和拾取摩擦角度减小。此外，仿真结果表明，通过增加组装中颗粒的偏心，垂直应变，动员角度ATPICK状态和包装摩擦由于达到其最大值，然后减少。更多的粒子，具有较大粒子的富分级组件，摩擦角和强度的最大值是ea rned。

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