标题：CFD-DEM Simulations of Seepage-Induced Erosion
作者：Xiao, Qiong; Wang, Ji-Peng
作者机构：[Xiao, Qiong] Southeast Univ, Sch Civil Engn, Nanjing 210096, Peoples R China.; [Wang, Ji-Peng] Shandong Univ, Sch Civil Engn, Jinan 250061, Peoples 更多
通讯作者地址：Wang, JP (corresponding author), Shandong Univ, Sch Civil Engn, Jinan 250061, Peoples R China.
关键词：seepage; hydraulic gradient; fine particles; porosity; drag force;; fabric anisotropy; computational fluid dynamics
摘要：Increases in seepage force reduce the effective stress of particles and result in the erosion of particles, producing heave failure and piping. Sheet piles/cutoff walls are often employed in dams to control the seepage. In this study, a computational fluid dynamics solver involving two fluid phases was developed and coupled with discrete element method software to simulate the piping process around a sheet pile/cutoff wall. Binary-sized particles were selected to study the impact of fine particles on the mechanisms of seepage. The seepage phenomenon mainly appeared among fine particles located in the downstream side, with the peak magnitudes of drag force and displacement occurring around the retaining wall. Based on the particle-scale observations, the impact of seepage produced a looser condition for the region concentrated around the retaining wall and resulted in an anisotropic condition in the soil skeleton. The results indicate that heave behavior occurs when the drag force located adjacent to the boundary on the downstream side is larger than the corresponding weight of the bulk soil.