Characteristics of volume and suction of undisturbed unsaturated loess under triaxial compression

4th International Conference on Energy Equipment Science and Engineering

Li, J.S.^1^2^3^4 ; Zheng, A.R.^1^2^3^4 ; Zhang, Y.Y.^5

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: Compression curves;    Compression properties;    Confining pressures;    Degree of saturations;    Different water contents;    Modified Cambridge model;    Triaxial compression;    Virgin compression;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/242/6/062017/pdf
DOI  :  10.1088/1755-1315/242/6/062017

来源: IOP

【 摘 要 】

The compression 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 virgin compression. Test results showed unsaturated loess have similar compression properties on the compression curve of saturated soil on the semi-logarithmic plane of average net stress, with yield points, which can be expressed by straight lines before and after yielding. With an increase of degree of saturation, compressibility gradually increases. The matric suction of unsaturated loess gradually decreases, and the variation is similar to that of volume. The parameters for the Modified Cambridge model were obtained to describe the compression of unsaturated soils.