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The effect of freeze-thaw cycling on the mechanical properties of expansive soils

膨胀性粘土 岩土工程 凝聚力(化学) 土壤水分 覆岩压力 摩擦角 三轴剪切试验 地质学 复合材料 材料科学 剪切(地质) 土壤科学 化学 有机化学
作者
Liang Tang,Shengyi Cong,Lin Geng,Xianzhang Ling,Fada Gan
出处
期刊:Cold Regions Science and Technology [Elsevier BV]
卷期号:145: 197-207 被引量:118
标识
DOI:10.1016/j.coldregions.2017.10.004
摘要

Expansive soils, which contain the clay mineral montmorillonite, are extensively distributed throughout many regions of the world and represent a source of risk to civil engineering structures. For example, some cutting slopes on the Jilin-Tumen-Hunchun high-speed railway in Northeast China consist of expansive soils. These soils, when exposed to freeze-thaw (F-T) cycles, can cause heavy economic losses, as well as present risk to the earth retaining system. In this study, consolidated-undrained (CU) triaxial tests were performed to investigate the effect of F-T cycles on the strength of expansive soils. The stress-strain relationship, elastic modulus, failure strength, effective stress paths, and effective shear strength parameters (i.e., effective cohesion and internal friction angle) were measured for expansive soils after a maximum of 9 F-T cycles. The test results indicate that expansive soils tend to exhibit strain-hardening behavior as the confining pressure is increased. By increasing the number of freeze-thaw cycles (NFT), the elastic modulus, failure strength, and effective shear strength parameters (i.e., effective cohesion and internal friction angle) of expansive soils decrease significantly. However, when the NFT exceeds a threshold value, the effect of F-T cycles on the strength behaviors of expansive soils is not significant. With the increase in the number of F-T cycles, the curvature of the effective stress paths also increases. In addition, based on the experimental results, a unified stress-strain relationship considering the effect of F-T cycles on the mechanical behavior of expansive soils was formulated in a disturbed state concept (DSC) framework. A state function based on the DSC was employed to characterize the gradual change in state of the expansive soils under the influence of F-T cycles.
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