冻融循环对不同压实度下膨胀土力学特性影响的试验研究

doi:10.13722/j.cnki.jrme.2022.0767

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Abstract 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.

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

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	Articles by authors
	CHEN Yong1
	2
	HUANG Yinghao2
	WANG Shuo2
	CAI Zhengyin2
	MU Yanhu3

Cite this article:

CHEN Yong1,2,HUANG Yinghao2, et al. Effects of freeze-thaw cycles on mechanical properties of expansive soils at different compaction degrees[J]. , 2023, 42(S2): 4299-4309.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0767 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS2/4299

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