Triaxial shear strength of undisturbed unsaturated loess

4th International Conference on Energy Equipment Science and Engineering

Li, J.S.^1^2^3^4 ; Jin, S.L.^5 ; Zheng, A.R.^1^2^3^4

CCCC Tianjin Port Engineering Institute Co. Ltd., Tianjin

300222, China^1

CCCC First Harbor Engineering Co. Ltd., Tianjin

300461, China^2

Key Laboratory of Port Geotechnical Engineering, Ministry of Communications of PRC, Tianjin

300222, China^3

Key Laboratory of Port Geotechnical Engineering of Tianjin, Tianjin

300222, China^4

China Institute of Water Resources and Hydropower Research, Beijing

10038, China^5

关键词: Confining pressures;    Different water contents;    Exponential expression;    Initial Moisture Content;    Initial water contents;    Internal friction angle;    Triaxial shear strength;    Unsaturated loess;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/242/6/062011/pdf
DOI  :  10.1088/1755-1315/242/6/062011

来源: IOP

【 摘 要 】

The strength of unsaturated loess was explored with triaxial instrument for unsaturated soils. The test covered 3 different water contents of unsaturated loess and the saturated loess at initial confining pressures of 100 kPa, 200kPa and 400 kPa. The matric suction and volume change were obtained during shearing procedure. Test results showed that the shear of saturated and unsaturated loess was strain-hardening with no obvious peak and contracted in volume. The matric suction during shearing was affected by both stress state and initial moisture content. The internal friction angle remained unchanged basically with variation of initial water content, and total cohesion decreases with an increase of initial water content, which can be expressed by an exponential expression.