岩土工程学报2013，Vol.35Issue(z1)：68-75,8.
非饱和结构性黄土的强度特性试验研究
Experimental research on the strength characteristic of unsaturated structural loess
摘要
Abstract
The loess is structural and unsaturated.Direct shear tests on intact loess and remold loess are firstly carried out by controlling the matric suction of unsaturated soil.Then the effect of the matric suction on the net stress strength index,parameter (φ)b in the Fredlund shear strength formula and parameter x in the Bishop effective stress formula of unsaturated soil is analyzed respectively.The experimental results show that net stress strength index increases with the increasing matric suction,(φ)b and x decreases with the increasing matric suction,and under the same matric suction,the net stress strength index,(φ)b and x of the intact loess are all larger than those of the remold loess.Besides,the unconfined compressive strengths of the intact loess,remold loess and saturated loess are measured by means of the single axial compression instrument.According to the definition of structural indices,the structural index of intact loess and remold loess with different water contents are obtained based on the unconfined compressive strength.Finally,the relationship among the net stress strength index and parameters (φ)b,x and structural index is also explored.The values of (φ)b and x unsaturated loess have the monotonic variation with the structural index.Under the same configuration conditions,the values of (φ)b and x of the intact loess are greater than those of the remolded loess,which reflects the differences in structural traits of the two types of unsaturated soil.关键词
黄土/强度/基质吸力/非饱和特征参数Key words
loess/ strength/ matric suction/ characteristic parameter of unsaturated soil分类
建筑与水利引用本文复制引用
马秀婷,邵生俊,杨春鸣,李小林..非饱和结构性黄土的强度特性试验研究[J].岩土工程学报,2013,35(z1):68-75,8.基金项目
国家自然科学基金项目(10872161,41272320) （10872161,41272320）
教育部高等学校博士学科点专项科研基金项目(20106118110011) （20106118110011）
