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Indexed by:期刊论文

Date of Publication:2022-06-30

Journal:水利学报

Issue:4

Page Number:425-432

ISSN No.:0559-9350

Abstract:A series of dynamic triaxial tests were performed to measure variations of dynamic behaviors of silt clay subjected to drying-wetting cycles based on the modified unsaturated C.K.C cyclic loader triaxial testing system. The effect of drying-wetting cycles on the dynamic strength and the relationship between accumulated plastic strain and number of loading cycles under saturate condition were studied. The dynamic strength under different matric suctions after repeated drying-wetting were also analyzed. The test results show that drying-wetting cycle has significant influence on the deformation characteristics of silt clay, and the accumulated plastic strain of the specimens subjected to drying-wetting cycle is smaller than that of the original specimens under the same dynamic stress and number of loading cycles; the critical dynamic stress and dynamic strength increase significantly after drying-wetting cycle; and the critical dynamic stress and dynamic strength increase with a reduced growth rate with increasing matric suction after repeated drying-wetting cycle. Scanning electron micrographs show that soil particles are drawn closer together during drying-wetting cycle process; whereas, micro-cracks do not appear in the soil specimens after drying-wetting cycle. ©, 2015, China Water Power Press. All right reserved.

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