Three-dimensional DEM simulation of cone penetration test by using circumferential periodic boundary
YANG Yancheng1,DENG Yibing1,SHI Danda1,XUE Jianfeng2
(1. School of Ocean Science and Engineering,Shanghai Maritime University,Shanghai 201306,China;2. School of Engineering and Information Technology,Federation University Australia,Melbourne 3842,Australia)
Abstract:In order to explore the micro-mechanism of CPT,a new circumferential periodic boundary was developed to consider the three-dimensional axisymmetric problem with 1/4 of the cylinder. To validate the method,a drained triaxial test was modeled with the proposed method and the traditional full model. The results are comparable and the proposed method is very effective. The method was further used to simulate a cone penetration test in dry Fontainebleau sand. It was found that,the variation of cone radial stress and tip resistance during penetration from the model are in good agreement with the reported test results. The micromechanical responses,such as the distributions of particle displacement,internal stress and local porosity to cone penetration are extensively studied. The evolutions of fabric anisotropy during penetration are also discussed. The relationship between stress and fabric is quantitatively described using fabric tensor,which reveals the mechanism of cone penetration capacity microscopically. The results of the work not only improve the efficiency of three-dimensional discrete element method(DEM) simulation,but also promote better understanding of CPT mechanism.
杨彦骋1,邓益兵1,史旦达1,薛剑峰2. 采用环向周期边界的静力触探三维离散元模拟[J]. 岩石力学与工程学报, 2016, 35(S1): 3372-3384.
YANG Yancheng1,DENG Yibing1,SHI Danda1,XUE Jianfeng2. Three-dimensional DEM simulation of cone penetration test by using circumferential periodic boundary. , 2016, 35(S1): 3372-3384.
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