Numerical Simulation of Direct Shear Test Using Elliptical Particles
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.
direct shear test discrete element method granular soils
Morteza Naeij Ali Aaghar Mirghasemi
School of Civil Engineering,College of Engineering,University of Tehran,Tehran,Iran
国际会议
北京
英文
441-450
2012-10-15（万方平台首次上网日期，不代表论文的发表时间）