CHENG Fuyang, HUANG Ying, ZHOU Zhiwei, ZHAO Guigang, ZHANG Junfeng. 2017: UNDRAINED TRIAXIAL TEST OF SATURATED LATERITE UNDER DRYING-WETTING CYCLE. JOURNAL OF ENGINEERING GEOLOGY, 25(4): 1017-1026. DOI: 10.13544/j.cnki.jeg.2017.04.016
    Citation: CHENG Fuyang, HUANG Ying, ZHOU Zhiwei, ZHAO Guigang, ZHANG Junfeng. 2017: UNDRAINED TRIAXIAL TEST OF SATURATED LATERITE UNDER DRYING-WETTING CYCLE. JOURNAL OF ENGINEERING GEOLOGY, 25(4): 1017-1026. DOI: 10.13544/j.cnki.jeg.2017.04.016

    UNDRAINED TRIAXIAL TEST OF SATURATED LATERITE UNDER DRYING-WETTING CYCLE

    • The influence of drying-wetting cycle to the shear characteristic of saturated laterite is studied in this paper. Undrained triaxial tests of Yunnan laterite at drying-wetting cycle are performed using type TSZ-2 full automatic triaxial test apparatus. It considers drying-wetting cycle number and drying-wetting cycle amplitude. The results show that as the drying-wetting cycle number and the drying-wetting cycle amplitude increase, the strain-softening phenomenon of saturated laterite generally enhances, the initial slope of stress-strain curve and pore water pressure peak increase, the peak shear strength and its corresponding axial strain, cohesion, internal friction angle decrease under unconsolidated undrained condition. The influence of drying-wetting cycle number is more obvious than that of its amplitude. Interaction between laterite and water is the essence of the change of shear characteristic of saturated laterite at drying-wetting cycle. They include the escape of water, the adsorption of laterite particles, hardening and shrinkage of laterite under the condition of dehydration and the wedging, lubricating, softening of water, expansion of laterite in the process of moistening. The deepening and intensifying of above actions at drying-wetting cycle can seriously damage the microstructure of laterite, ultimately change its shear characteristic.
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