基于非圆颗粒Trapdoor试验模拟土拱效应

摘要

基于离散元颗粒流理论,从细观角度出发,应用PFC2D中CLUMP方法通过二次开发得到更接近砂土颗粒形状的"椭圆团"颗粒模拟Trapdoor试验过程中的土拱效应,并分析了Trapdoor位移、颗粒形状、颗粒摩擦系数、Trapdoor宽度对土拱效应的影响.结果表明,随着Trapdoor位移的增大,土体内部会形成拱效应,且随着颗粒长短轴比和摩擦系数的增大拱效应会进一步增强;但随着Trapdoor宽度的增加而减弱.%Based on the particle flow code theory,the elliptical particle was developed by using the clump logic in PFC2D(two-dimensional particle flow code )to simulate the soil arching of sand in Trapdoor tests. The influence of trapdoor displacement, particle shape, particle frictional coefficient and the width of Trapdoor on soil arching were also studied. Numerical results show that the soil arching appears with the movement of Trapdoor, the soil arching strengthens with the increasement of the ratio of axis of particle and particle frictional coefficient, and the soil arch-ing weakens with the increasement of the width of Trapdoor.