摘要
渗蚀会导致土体内部颗粒流失,改变土体内部应力的分布。为了探究间断级配土内部随着细颗粒流失内部力链演化过程,利用CFD-DEM(流体力学-离散元方法)模拟了在0.1N的压力下(模拟近表层土体),在i=5、8、11水力梯度作用下颗粒流失过程,在恒定水力梯度i=8作用下0.1、5、10N作用力的作用下颗粒流失过程。结果表明在0.1N作用下,随着水力梯度的增加颗粒渗蚀速率越来越大,但是最终渗蚀量越来越小;在恒定水力梯度i=8作用下随着压力的增加,颗粒渗蚀速率越来越慢;土体内部渗蚀过程基本分为四个阶段;土体内部渗蚀后内部力链分布以粗颗粒-粗颗粒接触为主,文中通过CFD-DEM方法研究了土体内部渗蚀过程中微观机理,为后续渗蚀理论研究提供了基础。
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.
出处
《低温建筑技术》
2024年第5期112-115,共4页
Low Temperature Architecture Technology
