压实红黏土的湿化变形试验研究  

Experimental study on wetting deformation of compacted laterite

作　　者：谈云志[1,2] 孔令伟[2] 郭爱国[2] 万智[3] 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [3]湖南省交通科学研究院,湖南长沙410015

出　　处：《岩土工程学报》2011年第3期483-489,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51009084);交通部西部交通建设科技项目(200631878530);中国科学院知识创新工程重要方向项目(kzcx2-yw-150);岩土力学与工程国家重点实验室重点项目(SKLZ0803)

摘　　要：为模拟路基土体在湿化与交通荷载耦合作用下的变形规律,对传统湿化变形试验方法进行了改进,并研制出一套改进后的湿化变形试验装置。认为湿化变形是由基质吸力丧失而产生,由此推导出丧失基质吸力与湿化变形的定量关系。利用改进的装置研究了红黏土的湿化变形规律及其湿化变形模量。结果表明,红黏土的初始压实状态对其变形影响显著,变形过程可以分为启动、加速和稳定三个阶段。未湿化试样的变形主要发生在启动阶段,而湿化试样的变形则主要发生在加速阶段。In order to simulate the subgrade deformation caused by the coupling effect of wetting and traffic loads,the traditional wetting deformation test method is improved,and a set of upgraded wetting-deformation equipments are developed.It is regarded that the wetting deformation is generated by the loss of matrix suction,and a constitutive relationship between lost matric suction and wetting deformation deduced.Finally,the wetting-deformation regularity and modulus are studied by using the improved device.The results show that the initial compaction state of laterite has significant effect on the deformation,and the process can be divided into three stages： initiation,acceleration and stability ones.Deformation of the specimen without wetting mainly occurs at the initiation stage,while the wetting deformation of the specimen mainly occurs at the acceleration stage.

关 键 词：红黏土 路基 湿化变形 湿化模量 

分 类 号：TU443[建筑科学—岩土工程]