侧限应力状态下非饱和膨润土的变形特性  

Deformation Characteristics of Unsaturated Bentonite under K_0-Compression Stress State

作　　者：孙文静[1] 孙德安[1] 闫威[1] 

机构地区：[1]上海大学土木工程系,上海200072

出　　处：《上海大学学报（自然科学版）》2010年第1期105-110,共6页Journal of Shanghai University:Natural Science Edition

基　　金：上海浦江人才计划资助项目(06DJ14043);教育部博士点基金资助项目(20093108110017)

摘　　要：采用测量侧向应力的压缩仪对不同初始密度和含水量的非饱和膨润土进行压缩试验,研究膨润土在侧限条件下由竖向荷载作用引起的变形及侧向应力的变化规律.根据试验结果,得到在含水量不变条件下非饱和膨润土的压缩变形特性,同时分析压缩过程中试样的孔隙比、饱和度及侧向应力的变化规律,归纳出非饱和膨润土中侧向应力与竖向应力之比与饱和度及竖向应力的关系.Deformation of unsaturated bentonite and change of lateral stress are studied through compression tests on unsaturated bentonite with lateral stress measured under vertical load. According to the test results, deformation characteristics of unsaturated bentonite with constant water content are obtained under the K0-compression stress state. Changes in void ratio, saturation degree and lateral stress are analyzed. Relationships between the ratio of total lateral stress against total vertical stress, the degree of saturation, and total vertical stress are obtained.

关 键 词：非饱和土 压缩试验 侧向应力 膨润土 

分 类 号：TU443[建筑科学—岩土工程]