网格尺寸对格栅—砂—黏土界面特性影响的离散元分析

为研究网格状带齿加筋砂垫层体的优化尺寸,通过采用二次开发的椭球形颗粒模拟砂土、平行黏结模型模拟筋材,建立了基于PFC3D颗粒流数值模型,系统分析了筋材横肋间距、齿筋高度及长短轴比3个变量对拉拔抗力的影响,揭示了筋土之间的相互作用机理.结果 表明:拉拔位移较小时,3个变量对拉拔阻力基本无影响;随着拉拔位移的增大,齿筋阻力...

Discrete Element Analysis on Influence of Grid Size onGrid-Sand-Clay Interface Characteristics

Aiming at studying the optimized size of dentate reinforced sand cushion,the simulationmodel based on PFC3Dparticle flow is established.In this model,the secondary developed elliptical groupparticles are developed to simulate the sand,and the reinforcement is simulated using parallel-bond model.The influence of traverse ribs′spacing,height of the denti-inclusions and the ratio of long and short axis onthepull-out resistance is revealed.The results show that the pull-out resistance for the three variables isbasically unchanged when the pull-out displacement is small.With the increase of pull-out displacement,the resistance of denti-inclusions,transverse rib and longitudinal rib gradually develop.Under the same porosityand sand thickness,the optimal mesh size and height of denti-inclusions is 6d50and 1.2d50respectively.The studyresults can provide reference for the applicationof geo-grid in project.