冻融循环作用下黄土基水泥土三轴压缩力学特性及本构模型研究

doi:10.11896/cldb.24100069

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Abstract Loess is widely distributed in northwest China. Loess-based cemented soil is a new type of solid waste resource under green construction and carbon reduction goal in China. In order to study the deterioration of mechanical properties of loess-based cemented soil after freeze-thaw cycles, triaxial compression tests were carried outon loess-based cemented soil under different freeze-thaw cycles to analyze the effects of freeze-thaw cycles and confining pressures on their compressive strength. Using scanning electron microscopy and nuclear magnetic resonance techniques, the formation mechanism of strength and evolution mechanism of freeze-thaw damage of loess-based cemented soil were revealed. Then based on the theory of statistical damage mechanics, a triaxial constitutive model for loess-based cemented soil was derived considering the effects of freeze-thaw cycles and confining pressure. The results show that the triaxial compression failure modes of loess-based cemented soil are divided into “Y” shear failure, “X” conjugated compression-shear zone failure and “H” shear-fracture zone failure. With the increase of freeze-thaw cycles, the failure properties gradually change from brittle to ductile. The freeze-thaw cycle mainly reduces the shear strength by deteriorating the cohesion, while has little effect on the internal friction angle of loess-based cemented soil. The essence of freeze-thaw damage is that the frost swelling force generated by the internal water phase transition weakens the cementing force of C-S-H gel, and the internal pore size increase continuously, and the internal pores of the sample are interconnected, expanded and penetrated. The triaxial damage constitutive model for loess-based cemented soil derived comprehensively considers the effects of freeze-thaw cycles and confining pressure, and its expressions are simple and its parameters have clear physical meanings, enabling a good representation of the full stress-strain curve of cemented loess under freeze-thaw conditions and accurately describing the post-peak strain softening characteristics.

Key words： loess-based cemented soil freeze-thaw cycles confining pressure mechanical property constitutive model statistical damage mechanics

Published: 10 November 2025 Online: 2025-11-10

CLC number:

TU411

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	Articles by authors
	YIN Pulong
	LI Yan
	TIAN Yong
	ZHAI Yue
	LI Le
	HE Junyu
	JIA Yu
	CHENG Yuhan

Cite this article:

YIN Pulong,LI Yan,TIAN Yong, et al. Study on Triaxial Compressive Mechanical Properties and Constitutive Model of Loess-based Cemented Soil Under Freeze-Thaw Cycle[J]. Materials Reports, 2025, 39(21): 24100069-8.

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https://www.mater-rep.com/EN/10.11896/cldb.24100069 OR https://www.mater-rep.com/EN/Y2025/V39/I21/24100069

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