摘要
分别将10%、20%、30%、40%的粉砂掺入膨胀土中,并以干密度为变量,通过变水头渗透实验来研究掺砂量与干密度对粉砂改良膨胀土渗透性的影响,对实验结果进行指数拟合.结果表明:掺砂比和干密度对改良膨胀土的渗透系数具有显著影响.干密度不变时,改良土的渗透系数随着粉砂掺量的增加逐渐增大,两者变化关系呈指数形式;粉砂掺量不变时,改良土的渗透系数随着干密度的增加逐渐减小,两者变化关系呈负指数形式.通过控制干密度(现场压实度)、掺砂量,可显著提高粉砂改良膨胀土路基的渗透性.
Adding 10%,20%,30%,40%silt into expansive soil respectively,and taking dry density as variable,effect of sand content and dry density on permeability of expansive soil improved by silt was explored by variable head permeability test,exponential fitting of test results.The results show that sand ratio and dry density have great influence on permeability coefficient of improved expansive soil.When the dry density is constant,the permeability coefficient of improved soil increases gradually with the increase of silt content,and the relationship between the two changes is in an exponential form.When the silt content is constant,as the dry density of the improved soil increases,the permeability coefficient gradually decreases;and the relationship between the two is in a negative exponential form.By controlling dry density(on-site compactness)and sand mixing ratio,the permeability of the silt-improved expansive soil subgrade can be significantly improved.
作者
邱翱博
王欢
张旭
QIU Aobo;WANG Huan;ZHANG Xu(School of Civil Engineering and Architecture,Henan University,Henan Kaifeng 475004,China)
出处
《河南大学学报（自然科学版）》
CAS
2022年第4期479-485,共7页
Journal of Henan University:Natural Science
基金
河南省高等学校重点科研项目(18A580002)
河南省高等学校重点科研项目(20A580001)
开封市科技发展计划项目(1801004)
河南省重点研发与推广专项(科技攻关)项目(202102310590)
关键词
膨胀土
粉砂
干密度
渗透系数
掺砂比
expansive soil
silty soil
dry density
permeability coefficient
mixing sand ratio
