Abstract Particle flow code in three dimensions (PFC3D) is used to investigate the bearing capacity and mechanism of a geomembrane-lined landfill under construction loading. The soils and the geomembranes are simulated by numerous balls and parallel bond, respectively. The initial states and loading processes of geomembrane-lined soil are simulated by PFC3D method. The displacement vector diagram, the velocity vector diagram, the stress and the porosity of soil were analyzed using the numerical models. The simulation results demonstrate that the geomembranes keep the underneath soil particles from being displaced under the applied load and can distribute the load uniformly over a wider area. The interface between soil particles and geomembranes, the displacement vector, the contact force and the deformation of the geomembranes are also analyzed. The results showed that the vertical loading affect strength-strain behavior of geomembranes. The contribution of radial displacements on strain and, consequently, the stress crack and potential failure mechanism of geomembranes were analyzed.

中文翻译：

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竖向荷载作用下土工膜衬里垃圾填埋场的DEM分析

摘要 三维粒子流编码（PFC3D）用于研究土工膜衬里垃圾填埋场在施工荷载下的承载能力和机理。土壤和土工膜分别由多个球和平行键模拟。采用PFC3D方法模拟土工膜衬里土的初始状态和加载过程。利用数值模型分析了位移矢量图、速度矢量图、应力和土壤孔隙度。模拟结果表明，土工膜可以防止下面的土壤颗粒在施加的载荷下发生位移，并且可以将载荷均匀地分布在更大的区域内。还分析了土颗粒与土工膜的界面、位移矢量、接触力和土工膜的变形。结果表明，竖向荷载影响土工膜的强度-应变行为。分析了径向位移对应变的影响，进而分析了土工膜的应力裂纹和潜在失效机制。