Effects of freeze-thaw cycles on mechanical properties of expansive soils at different compaction degrees

被引：0

作者：

Chen Y. ^{[1
,2
]}

Huang Y. ^{[2
]}

Wang S. ^{[2
]}

Cai Z. ^{[2
]}

Mu Y. ^{[3
]}

机构：

[1] School of Architecture, Tianjin University, Tianjin

[2] Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Jiangsu, Nanjing

[3] State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Gansu, Lanzhou

来源：

Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2023年 / 42卷

基金：

中国国家自然科学基金;

关键词：

compaction degree; expansive soil; freeze-thaw cycle; mechanical properties; pore parameters; soil mechanics; volume change behavior;

D O I：

10.13722/j.cnki.jrme.2022.0767

中图分类号：

学科分类号：

摘要：

Freeze-thaw cycles are an important reason for the deterioration of expansive soil mechanical properties in north Xinjiang. In this research，freeze-thaw cycle tests were carried out using a self-designed unidirectional environmental boundary loading device. On this basis，volume measurement，unconfined compressive strength，and scanning electron microscope tests were carried out. The characteristics of volume changes and mechanical properties of expansive soil at three different compaction degrees(90%，95% and 100%) were investigated. The evolution law of mechanical strength deterioration and microscopic pore development was quantitatively analyzed by grey relational analysis. The effect of pore change characteristics on the unconfined compressive strength of soil under freeze-thaw cycles was discussed. The tests results showed that the volume change of specimens gradually changed from shrinkage to swelling with the increased compaction degree. The hardening properties of expansive soils weakened with increasing compaction，and freeze-thaw cycles promoted the softening of stress-strain relationships. The unconfined compressive strength of the specimens was significantly reduced after the first freeze-thaw cycle，with attenuation amplitude from 56.07% to 67.54% after seven cycles. Freeze-thaw cycles also attenuated failure strain and resilient modulus to varying degrees. The correlation between the surface porosity and the unconfined compressive strength attenuation rate was 0.779–0.882，and the corresponding weight reached 0.467–0.471，with an excellent linear relationship. The study results provide a reference for constructing and maintaining expansive soil projects in north Xinjiang. © 2023 Academia Sinica. All rights reserved.

引用

页码：4299 / 4309

页数：10

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