INTERNAL EROSION MECHANISM ANALYSIS OF GAP-GRADED SOIL BY CFD-DEM
Erosion leads to the loss of particles within the soil,altering the distribution of stress in soil.This study aims to investigate the evolution of internal force chains in gapped-graded soil as fine particles are lost internally.Using the Computational Fluid Dynamics-Discrete Element Method(CFD-DEM)simulation method,the erosion pro-cesses are simulated under a pressure of 0.1 N(simulating near-surface soil)and under hydraulic gradients of i=5、8 and 11.Additionally,erosion processes are examined under constant hydraulic gradient i=8 with applied forces of 0.1、5 and 10 N.The results indicate that under 0.1N pressure,the rate of particle erosion increases with higher hy-draulic gradients,but the overall erosion volume decreases.Under constant hydraulic gradient i=8,increasing pres-sure leads to a slower rate of particle erosion.The erosion process within the soil can be divided into four stages and the distribution of internal force chains within the soil predominantly consists of coarse particle-to-coarse particle interactions.In this paper,the microscopic mechanism of soil internal erosion is studied by CFD-DEM method,pro-viding a basis for the subsequent theoretical study of soil infiltration.
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