Shear strength of an unsaturated weakly expansive soil  

作　　者：Weimin Ye Yawei Zhang Bao Chen Xiuhan Zhou Qiang Xie 

机构地区：[1]Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai,200092,China [2]United Research Center for Urban Environment and Sustainable Development of Ministry of Education,Shanghai,200092,China [3]Wuhan-Shiyan Expressway Management Bureau in Hubei Province,Wuhan,430000,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2010年第2期155-161,共7页岩石力学与岩土工程学报（英文版）

基　　金：Supported by the China National Key Technology R&D Program(2006BAJ27B02-02);the National Natural Science Foundation of China(40772180,40728003);Shanghai Leading Academic Discipline Project(B308)

摘　　要：To study the weakly expansive clay obtained from a slope along Wuhan—Shiyan expressway in Hubei Province,soil-water property tests and some unsaturated triaxial tests with suction control were conducted,and the soil-water retention curve（SWRC） and unsaturated shear strength of this soil were obtained.Results show that the air-entry suction and the residual degree of saturation of the tested soil are 106 kPa and 8%,respectively.The boundary effect zone and the transition zone can be identified on the desorption curve,but the residual zone is not so obvious.The unsaturated shear strength increases as suction increases within the range of controlled suction in the test,and friction angle,b,in the triaxial shear test is 17.6°.Based on the results,constitutive models for predicting the unsaturated shear strength using the SWRC were evaluated,and comparisons between prediction and measurement were made.It is concluded that for engineering purpose,the constitutive model should be carefully selected based on soil properties when predicting the unsaturated shear strength using the SWRC.To study the weakly expansive clay obtained from a slope along Wuhan—Shiyan expressway in Hubei Province,soil-water property tests and some unsaturated triaxial tests with suction control were conducted,and the soil-water retention curve（SWRC） and unsaturated shear strength of this soil were obtained.Results show that the air-entry suction and the residual degree of saturation of the tested soil are 106 kPa and 8%,respectively.The boundary effect zone and the transition zone can be identified on the desorption curve,but the residual zone is not so obvious.The unsaturated shear strength increases as suction increases within the range of controlled suction in the test,and friction angle,b,in the triaxial shear test is 17.6°.Based on the results,constitutive models for predicting the unsaturated shear strength using the SWRC were evaluated,and comparisons between prediction and measurement were made.It is concluded that for engineering purpose,the constitutive model should be carefully selected based on soil properties when predicting the unsaturated shear strength using the SWRC.

关 键 词：unsaturated soil soil-water retention curve（SWRC） weakly expansive soil SUCTION shear strength 

分 类 号：TU432[建筑科学—岩土工程] S152.7[建筑科学—土工工程]