【摘要】 利用颗粒流程序(PFC2D)对土工合成材料的拉拔试验进行模拟,着重从细观角度来分析土工合成材料与土的接触界面。通过室内拟合试验,选取和校准离散元的细观参数,土工合成材料用平行黏结模拟,土颗粒采用由3个圆形颗粒组成一个椭圆形团进行数值模拟。数值模拟结果表明,接触界面的厚度为6～7倍平均土颗粒直径,接触界面中的颗粒发生较大相对位移,孔隙率增大,接触数减小。PFC2D为从细观角度研究土工合成材料与土的接触界面特性的理想工具。更多还原

【Abstract】 PFC2D is adopted to simulate geosynthetics pullout tests and the interface between geosynthetics and soil with emphasis on the meso-analysis.Suitable mesoscopic discrete element parameters are selected and calibrated so that the results of the simulation fit well with those of the laboratory experiment.Parallel bond is employed to simulate geosynthetics;and elliptical clump comprised of three disc particals is used as soil partical.The numerical results show that the interface thickness is to be approxiately 6 to 7 times of the average particle diameters;and the particles in the zone undergo larger relative displacement;the porosity increases,the coordination number decreases.PFC2D is one of the most perfect numerical tools to study the interface between geosynthetics and soil from mesoscopic point of view.更多还原