基于计算流体力学-离散元耦合的相对密实度对断级配土体渗蚀效应的影响研究

张沛云; 木林隆; 黄茂松

doi:10.16285/j.rsm.2023.0053

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基于计算流体力学-离散元耦合的相对密实度对断级配土体渗蚀效应的影响研究

更新时间：2026-06-28

- 基于计算流体力学-离散元耦合的相对密实度对断级配土体渗蚀效应的影响研究
- Vol. 45, Issue 1, Pages: 267-283(2024)
- 作者机构：
  
  1. 同济大学岩土及地下工程教育部重点实验室
  2. 同济大学地下建筑与工程系
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2023.0053
  CLC： TU43
- Online First：17 January 2024，
  
  Published：2024
- 稿件说明：
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张沛云, 木林隆, 黄茂松. 基于计算流体力学-离散元耦合的相对密实度对断级配土体渗蚀效应的影响研究[J]. 2024, 45(1): 267-283.
DOI：

张沛云, 木林隆, 黄茂松. 基于计算流体力学-离散元耦合的相对密实度对断级配土体渗蚀效应的影响研究[J]. 2024, 45(1): 267-283. DOI： 10.16285/j.rsm.2023.0053.

摘要

土体几何因素（粒径比、细粒含量、相对密实度等）不仅影响土体内部稳定性，同时对侵蚀进程有着重要影响。基于离散单元法（discrete element method，简称DEM）与计算流体动力学（computational fluid dynamics，简称CFD）耦合方法，建立了内部不稳定土渗流-侵蚀三维计算模型。考虑细粒含量及相对密实度对内部侵蚀过程的耦合影响，对细观变量：土体孔径分布曲线、颗粒接触数目以及内部传力机制进行分析，以揭示细粒含量与相对密实度的影响的细观机制。研究结果表明：相对密实度的增加降低了侵蚀质量比，且该影响程度与细粒含量相关，细粒含量越高，相对密实度的影响更加明显；内部不稳定土体渗蚀后沿渗流方向可分为上游侵蚀区、中部稳定区及下游侵蚀区。土体渗透性在侵蚀过程中的增长幅度随相对密实度的降低而逐渐增加，随细粒含量的增加而增加；相对密实度对渗蚀过程的影响可归因于三方面：相同水力梯度下渗流流量不同，内部孔隙尺寸分布存在差异，以及细颗粒对土体内部应力传递的贡献不同。研究结果加深了土体几何因素对内部渗蚀过程影响的理解，并为宏观侵蚀本构的建立提供了参考。

Abstract

The geometric characteristics of soil (gap ratio

fines content

relative density

etc.) not only affect the internal stability of soil but also have an important influence on suffusion development. Based on the coupled method of discrete element method (DEM) and computational fluid dynamics (CFD)

a three-dimensional computation model of suffusion for internally unstable soil is established

the coupled effects of fines contents and relative densities on the suffusion are investigated

and the mesoscopic variables including soil constriction size distribution (CSD)

coordination number and internal force transfer mechanism are analyzed to reveal the microscopic mechanism of the coupled influence from fines content and relative density. The results show that the increase in relative density decreases the erosion mass ratio

which is also highly related to fines content; the higher the fines content

the more obvious the effect of relative density. The specimen after erosion can be divided into “upstream erosion zone”

“central stable zone” and “downstream erosion zone”. The increment of soil permeability during suffusion decreases with increasing relative density

while it increases with increasing fines contents. The influence of relative density on the suffusion process can be attributed to three aspects: differences in flow rates under the same hydraulic gradient

variations in the distribution of internal pore sizes

and variations in the contribution of fine particles to stress transmission within the soil. The results deepen the understanding of the influence of soil geometric characteristics on suffusion processes and provide a reference for the establishment of macroscopic erosion constitutive relationship.

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