Experimental study of fine particles migration mechanism 
of sand-silt mixtures under train load

ZHANG Sheng; GAO Feng; CHEN Qi-lei; SHENG Dai-chao

doi:10.16285/j.rsm.2019.0690

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Experimental study of fine particles migration mechanism of sand-silt mixtures under train load

更新时间：2026-06-25

- Experimental study of fine particles migration mechanism of sand-silt mixtures under train load
- Vol. 41, Issue 5, Pages: 1591-1598(2020)
- 作者机构：
  
  1. 中南大学高速铁路建造技术国家工程实验室,湖南,长沙,410075
  2. 中南大学土木工程学院,湖南,长沙,410075
  3. 悉尼科技大学土木与环境工程学院,悉尼,澳大利亚
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2019.0690
  CLC： TU441
- Online First：07 July 2020，
  
  Published：2020
- 稿件说明：
移动端阅览
ZHANG Sheng, GAO Feng, CHEN Qi-lei, et al. Experimental study of fine particles migration mechanism of sand-silt mixtures under train load[J]. 2020, 41(5): 1591-1598.
DOI：

ZHANG Sheng, GAO Feng, CHEN Qi-lei, et al. Experimental study of fine particles migration mechanism of sand-silt mixtures under train load[J]. 2020, 41(5): 1591-1598. DOI： 10.16285/j.rsm.2019.0690.

摘要

荷载作用下砂粉土动水力特性与细颗粒迁移研究是分析振动液化、翻浆冒泥等自然或工程灾变过程细观致灾机制和演化机制的基础与关键。利用自主研制的试验系统，开展了模拟列车动-静组合荷载作用下饱和砂粉土动水力特性及细粒迁移机制试验。试验结果表明：动-静组合荷载作用下试样的轴向变形呈现出台阶式变化特点；试样的总应力分布随着深度的增加表现出显著的指数减小趋势；孔隙水压力反复经历了动荷载作用下的累积与静荷载作用下的消散过程，并且在该过程中轴向孔隙水压力梯度逐渐对孔隙水形成“抽吸”作用，促使细颗粒产生迁移和集聚。通过分析试样不同层位深度处3种粒径组颗粒含量及有效粒径d10的变化规律，研究了动-静组合荷载作用对饱和砂粉土中细颗粒发生层间迁移流动的影响机制。

Abstract

The study of dynamic-hydraulic characteristics and fine particle migration of sand-silt mixtures under load is the basis and key for analyzing the mesoscopic disaster-causing mechanism and evolution mechanism of natural or engineering disasters such as vibration liquefaction and mud pumping etc. The experimental study on fine particles migration mechanism of saturated sand-silt mixtures under combined dynamic-static train load was carried out by using the self-developed test system. The experimental results show that the axial deformation of the sample exhibits a “stepped” change trend. The total stress distribution shows an exponential decrease with increasing depth. The pore water pressure in the sample experiences the cyclic process of accumulation under dynamic loading and dissipation under static loading. In this process

the axial gradient of pore water pressure gradually forms a "pumping" effect on pore water

which causes the migration of fine particles and water. Furthermore

by analyzing the composition change of three particle size groups contents and effective diameter d10 of different layers of the sample

it is analyzed the combined dynamic-static loads affect fine particle migration in saturated sand-silt mixtures.

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