含水率对分散性土抗剪强度特性影响的微观解释

doi:10.13278/j.cnki.jjuese.20200318

Abstract

Abstract: As a special water-sensitive soil, dispersive soil has the characteristics of collapse and disintegration when encountering water, which isnot conducive to water conservancy projects and geotechnical engineering. In order to enhance the research on the mechanical strength as well as the influential mechanism of dispersive soil, in this paper, the dispersive soil in Qian’an area in the west of Jilin Province was taken as the research object,and the remolded soil samples with different water contents (5.0%-24.0%) were tested and observed respectively by direct shear test (under vertical pressures including 50, 100, 200 and 300 kPa) and scanning electronic microscope (SEM). The results show that:1) The increase of water content led to the transformation of shear stress-shear displacement curve from strain-softening to strain-hardening, the corresponding water content in the transition zone was between 8.0% and 11.0%, and the strain-hardening occurred preferentially under higher vertical pressures. 2) With the increase of water content, the cohesion decreased as a whole with the inflection points at 17.0% and 23.0% of water content, while the internal friction angle showed a decreasing-increasing-decreasing pattern, with the inflection points at 11.0% and 17.0% of water content; It is considered that the cohesion change is affected by both salt phase state and water content, while the change of internal friction angle is affected by cohesion and viscous resistance. 3) Affected by Na⁺, with the increase of water content, the clay bound water film thickened rapidly, the structural units disintegrated gradually, the cementation of some particles weakened gradually, the structural units evolved from large particles into smaller ones, and the size of pores reduced. 4) A good correlation exists between the soil shear strength and main morphological parameters of the soil microstructure units obtained from the quantitative analyses on the SEM images (p<0.05), indicating that the decrease of shear strength is the macroscopic manifestation of the changes in the soil microstructure units induced by water content due to soil dispersity.

Key words: dispersive soil, water content, shear strength, microstructure

CLC Number:

TU411

Chen Jianping, Liu Jing, Wang Qing, Han Yan, Wang Jiaqi, Li Xinghua. Microscopic Interpretation of Water Content Influence on Shear Strength of Dispersive Soil[J].Journal of Jilin University(Earth Science Edition), 2021, 51(3): 792-803.

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Microscopic Interpretation of Water Content Influence on Shear Strength of Dispersive Soil

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