摘要
以宜彝高速公路匝道边坡施工为背景,对工程区滑坡带泥岩残积土进行了物理力学性质、含水率和干密度变化条件下的膨胀变形和强度劣化特性试验研究。试验结果表明:工程区的泥岩残积土为孔隙比大、级配不良、塑性指数高的高液限黏土,具有较强吸水性。不同含水率和干密度条件下的膨胀变形时程曲线均可分为快速增长、增长减缓和趋于稳定三个阶段,并拟合得到通用公式;干密度一定,膨胀变形随含水率增大而迅速减小,二者呈幂指数关系;含水率一定,膨胀变形随干密度的增大而增大。随着含水率增加,泥岩残积土抗剪强度参数迅速衰减。降雨入渗是导致该滑坡的主要诱因之一,在此基础上,针对泥岩残积土边坡的勘察、设计与施工提出了建议。
Based on the construction of ramp slope of Yibin-Yiliang Expressway,the physical and mechanical properties of mudstone residual soil in the landslide zone,and it's swelling deformation and strength deterioration characteristics under the conditions of moisture content and dry density changed were studied experimentally.The test results showed that the mudstone residual soil in the project area was a high liquid limit clay with large pore ratio,poor gradation and high plasticity index,and demonstrated strong water absorption.The time-history curves of expansion deformation under different moisture content and dry density conditions could be divided into three stages:rapid growth,slow growth and stable growth.A general formula was obtained by fitting.At constant dry density,the swelling deformation decreased rapidly with the increase of moisture content,exhibiting a power exponential relationship between them.With constant moisture content,the swelling deformation increases with the increase of dry density.With the increase of moisture content,the shear strength parameter of mudstone residual soil decreased rapidly.Rainfall infiltration was one of the main causes of the landslide.Based on this,some suggestions were put forward for the investigation,design and construction of mudstone residual soil slope.
作者
汪学军
WANG Xuejun(China Railway Sixth Bureau Group Shijiazhuang Railway Construction Co.,Ltd.,Shijiazhuang 050000,China)
出处
《国防交通工程与技术》
2024年第3期33-36,71,共5页
Traffic Engineering and Technology for National Defence
关键词
泥岩残积土
滑坡
强度劣化
干密度
含水率
膨胀变形
试验
mudstone residual soil
landslide
strength deterioration
dry density
moisture content
expansion deformation
test
作者简介
汪学军(1970—),男,高级工程师,主要从事铁路公路工程施工及管理工作。wangliushi6@sohu.com。
