摘要
以湖北省宜昌市的膨胀土为研究对象,采用当地广泛分布的风化砂来对膨胀土进行改良,即分别采用10%、20%、30%、40%、50%的风化砂掺入膨胀土中,通过改变各种不同比例混合料的初始干密度进行改良膨胀土回弹模量试验,研究掺砂比例、初始干密度对风化砂改良膨胀土回弹模量的影响规律。结果表明:掺砂比例和初始干密度均对改良膨胀土的回弹模量有显著的影响。当初始干密度一定时,改良膨胀土的回弹模量会随着掺砂比例的增加先增大后减小,且在掺砂比例为10%时改良膨胀土的回弹模量达到最大值;当掺砂比例一定时,改良膨胀土回弹模量随着初始干密度的增加而增大,增加幅度是先大后小;当掺砂比例一定时,改良膨胀土回弹模量与初始干密度呈现很好的对数关系,因此在施工过程中控制好初始干密度(现场压实度)将有助于提高路基承载能力,保证路基的强度、刚度和稳定性。
This paper takes the expansive soil as the research object and uses weathered sand to modify expansive soil in Yichang,Hubei.It changes the initial density of mixed materials to do the resilient modulus test with the weathered sand content of 3%,5%,7%,9%.The study shows that both the content of weathered sand and initial density have obvious effects on the resilient modulus test of expansive soil.The resilient modulus of modified expansive soil increases first then decreases along with the increases of weathered sand and it has the maximal value when the content is 10% with a certain initial density.The resilient modulus of modified expansive soil increases with the increase of initial density at a certain content of weathered sand and the growth rate is faster and then slower.The resilient modulus of modified expansive soil shows a logarithmic relationship with initial density at a certain content of weathered sand.It is helpful to increase the bearing capacity of subgrade and guarantee the strength,rigidity,stability of subgrade by controlling the initial density（compaction degree）in the process of construction.
出处
《安全与环境工程》
CAS
北大核心
2014年第5期154-157,共4页
Safety and Environmental Engineering
基金
湖北省教育厅自然科学研究重点项目(D20131304)
关键词
膨胀土
风化砂
初始干密度
掺砂比例
回弹模量
expansive soil
weathered sand
initial dry density
mixing sand proportion
resilient modulus
