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论文类型：期刊论文

发表时间：2022-06-30

发表刊物：水利学报

期号：3

页面范围：261-268

ISSN号：0559-9350

摘要：A series of consolidation undrained tests were performed using the stress-strain controlled triaxial apparatus to measure variations of mechanical behaviors of silt clay in Dalian during drying-wetting cycle. The stress-strain-relation, effective stress path, pore water pressure of the remolded specimens and the ones subjected to drying-wetting cycles were contrastively analyzed to discuss the effect of drying-wetting cycle on the mechanical behaviors of specimens under different initial dry densities. The test results indicate that the influence of drying-wetting cycle on soils related to the initial dry density of soils. For the specimens with initial dry density of 1.61 g/cm3, drying-wetting cycle altered the stress-strain relationship curves from strain hardening to strain softening, the development of pore water pressure converted from increase following by decrease to continue growing, and the effective stress path changed significantly. However, the stress-strain curve form was not changed for the specimens with initial dry density of 1.71 g/cm3 and 1.76 g/cm3, while the peak value of pore water pressure was increased resulting from drying-wetting, the effective stress path in the initial stage of shear was on the left side of the ones without subjected to drying-wetting cycle. The scanning electron micrographs proved that the drying-wetting cycle resulted in irreversible variation of soils skeleton structure. Rearrangement of the soil microstructure and compaction of the soil skeleton during drying-wetting cycle led to the irreversible change of mechanical behaviors of the soil.

备注：新增回溯数据