高含水率条件下压实黏性土路基永久变形  

Permanent deformation of compacted clay with high moisture content

作　　者：过震文[1,2] 钱劲松[3] 

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410114 [2]上海市市政规划设计研究院,上海200031 [3]同济大学教育部道路与交通工程重点实验室,上海200092

出　　处：《中南大学学报（自然科学版）》2016年第3期1058-1064,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50908176);交通运输部科技项目(2013319223010;2015318822170)~~

摘　　要：对上海地区3条公路的黏性路基土样进行室内动三轴重复加载试验,以考察潮湿多雨、高地下水位地区黏性土路基高含水率(通常大于最佳含水率)状态对其永久变形特征的影响。研究结果表明:含水率的较小幅度变化可引起黏性土永久变形成倍增加;Chai-Muria模型的拟合曲线表现出与试验值非常高的一致性,R2均保持在0.90以上,均大于Tseng-Lytton模型的拟合接近程度;使用路基土基本物性指标对Chai-Muria模型中的参数进行了回归分析,具有较好的预估效果。To explore and predict the influence of water content, especially high water content（ above optimum moisture content）, on the permanent deformation of compacted clay, a series of repeated load dynamic triaxial（RLT） tests were conducted on three kinds of soils in Shanghai. The experimental results reveal that the tested subgrade soils are extremely sensitive to moisture content. Curve fitting based on Chai-Muria model shows very high consistency with the test results and R2 are kept above 0.9, which is greater than that of Tseng-Lytton model. The model with parameters obtained by regression analysis based on soil properties has good result in prediction.

关 键 词：路基工程 永久变形 高含水率 预估模型 

分 类 号：V416.1[航空宇航科学与技术—航空宇航推进理论与工程]