水利学报2024，Vol.55Issue(8)：977-989,13.DOI:10.13243/j.cnki.slxb.20230775
渗流条件下夹层砂土中细颗粒迁移沉积特性试验研究
Experimental study on migration and deposition characteristics of fine particles in sandwich sand under seepage condition
摘要
Abstract
The problem of migration-deposition of fine particles in sandy soils with interbedded layers is widespread in groundwater recharge,infiltration of piles,design of reverse filtration layer and grouting.Using an indoor one-dimensional sand column test system,three kinds of sandy soils with typical grain sizes were selected,and the migration-deposition characteristics of suspended particles in sandy soils were investigated in two kinds of interlayer locations and thicknesses.The results show that the particle size has a significant effect on the migration-deposition process of fine particles in sand columns with interlayers.When the particle size ratio is larger than 1,the peak value of the suspended particles penetration curve is higher,and the amount of fine particles deposited in the interlayer increases abruptly;the closer the interlayer position is to the water injection end,the smaller the thickness is,and the larger the peak value and the sudden increase in deposition are.When the particle size ratio is less than 1,the peak value of the suspended particles penetration curve is lower,and there is no particle enrich-ment at the interlayer;the closer the interlayer is to the water outlet end,the greater the thickness,and the higher the peak value of the penetration curve.During the test,the migration and deposition of suspended particles will cause changes in the permeability coefficient.The process of permeability coefficient change corresponds to the change of penetration curve,and the process is divided into three kinds:deposition,stripping migration and dy-namic equilibrium.Fine particles are deposited in sandy soil by adsorption and accumulate at the adsorption.关键词
夹层/粒径比/迁移/沉积/渗透系数Key words
interlayer/particle size ratio/migration/deposition/permeability coefficient分类
建筑与水利引用本文复制引用
崔先泽,周钰錩,范勇,杨广栋..渗流条件下夹层砂土中细颗粒迁移沉积特性试验研究[J].水利学报,2024,55(8):977-989,13.基金项目
长江科学院开放研究基金项目(CKWV20221036/KY) （CKWV20221036/KY）
湖北省自然科学基金项目(2022CFB248) （2022CFB248）
国家自然科学基金项目(41702254) （41702254）
