基质吸力对非饱和黏土抗剪强度的影响  

Experimental Study on Effect of Matric Suction on Shear Strength Behavior of Unsaturated Clay Soil

作　　者：彭忠瑛[1] 时红莲[1,2] 蔡华炜[1] 

机构地区：[1]中国地质大学工程学院,湖北武汉430074 [2]教育部三峡地质灾害研究中心,湖北武汉430074

出　　处：《人民黄河》2012年第4期133-134,137,共3页Yellow River

基　　金：教育部长江三峡库区地质灾害研究中心开放基金资助项目(TGRC201011)

摘　　要：通过直剪试验,探讨了基质吸力与非饱和黏土抗剪强度的关系,结果表明:含水量对非饱和黏土基质吸力的影响较大,随着基质吸力的增大含水量减小,这种减小的趋势在基质吸力小于400 kPa时较明显;非饱和黏土抗剪强度与基质吸力之间的关系是非线性的,且存在转折点;基质吸力对非饱和黏土抗剪强度的提高有限。The relationship between the shear strength behavior and matric suction of unsaturated clay soil was investigated on the basis of pressure plate test and direct shear test.The results show that the matric suction is more sensitive to water content,the matric suction increase with the decrease of the water content,and this trend is obvious when the matric suction less than 400 kPa;the shear strength behavior and matric suction of unsaturated clay soil is nonlinear,and inflection point appears in the curve;in unsaturated condition,the shear strength of unsaturated clay soil does not increase obviously with the increasing matric suction.

关 键 词：非饱和黏土 抗剪强度 基质吸力 土—水特征曲线 

分 类 号：TU411.7[建筑科学—岩土工程]