岩土力学Issue(3)：675-682,8.
基于工程包边法的膨胀土抗剪强度干湿循环效应试验研究
Experimental research on shear strength of expansive soil under wetting-drying cycles based on wrapping method
摘要
Abstract
Wrapping method is a effective method to expansive subgrade. Based on the condition of wrapping method, a wetting-drying cycle path was designed for the expansive soil and lime-treated expansive soil. The strength properties were studied and discussed for the samples experiencing 6 wetting-drying cycles with the systematic research of the shear strength before and after wetting-drying cycles. The results show that the shear strength increases with the increasing dry density for remolded and lime-treated expansive soils in the range of compactness between 90%and 96%. The variation of shear strength parameters are different for the soil samples before and after wetting-drying cycles. The cohesion after wetting-drying cycles increases with the increasing of dry density; but the influence on internal friction angle is small. The dry density restricts residual strength little for remolded and lime-treated expansive soils after wetting-drying cycles. The residual strength parameters of expansive soils are different for the samples before and after wetting-drying cycles;and it is larger before wetting-drying cycles. The strength parameters including peak strength parameters and residual strength parameters are influenced by the range of wetting-drying cycles. Based on the influence of wetting-drying cycles and repeated shearing on strength parameters, it is suggested that the difference of residual strength parameters before and after wetting-drying cycles and its range can be considered to analyze the safety factor of expansive clay slope. And lime-treated expansive soil is fit for wrapping in the expansive soil subgrade.关键词
膨胀土/包边法/干湿循环/残余强度Key words
expansive soils/wrapping method/wetting-drying cycle/residual strength分类
建筑与水利引用本文复制引用
李新明,孔令伟,郭爱国,刘宇,刘学东..基于工程包边法的膨胀土抗剪强度干湿循环效应试验研究[J].岩土力学,2014,(3):675-682,8.基金项目
国家自然科学基金资助项目（No.51079141，No.10872210）；湖北省自然科学基金（No.2011CDB407）。 （）
