考虑水–汽对流及换热的非饱和硫酸盐渍土多物理场耦合模型：模型建立与验证

doi:10.3724/1000-6915.jrme.2025.0065

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Abstract Based on the mass conservation equation, energy conservation equation, solute migration equation, and soil stress-strain equation for unsaturated soil, a mathematical model was established to couple multiple physical fields, specifically the interactions of water, vapor, heat, salt, and mechanics in unsaturated sulfate saline soil. This model further incorporates the effects of water and vapor convection, including both liquid water and water vapor, as well as the latent heat of water vapor diffusion and convective heat transfer on the physical properties of saline soil, thereby enhancing existing models. Subsequently, the impact of periodic temperature variations on heat and mass migration, along with the deformation of sulfate saline soil, was analyzed through numerical modeling. Additionally, the validity of the proposed model was confirmed through experimental testing. The results indicate that when external water and salt supplies are disregarded, heat transfer in shallow saline soil primarily occurs through conductive heat flux and the latent heat flux associated with the water-salt phase transition, followed by convective heat flux from water vapor and latent heat flux from water vapor diffusion. The convective heat flux from liquid water is relatively minor and can be considered negligible. In shallow saline soil, the predominant mode of water migration is through water vapor flux; however, as depth increases, liquid water flux begins to dominate. When ambient temperature rises, salt concentration increases while crystalline salt content decreases in the saline soil, leading to a reduction in soil displacement, which indicates settlement deformation. Conversely, when ambient temperature decreases, the trends in salt concentration, crystalline salt content, and soil displacement reverse, suggesting that the soil undergoes expansion deformation during this period.

Key words： soil mechanics sulfate saline soil convective heat transfer heat and mass migration displacement multi-physical fields coupling model

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	Articles by authors
	ZHOU Zhixiong1
	ZHOU Fengxi1
	WANG Yongze2
	MA Qiang3
	ZHENG Yanbin1
	ZHANG Liujun4

Cite this article:

ZHOU Zhixiong1,ZHOU Fengxi1,WANG Yongze2, et al. Multi-physical fields coupling model of unsaturated sulfate saline soil considering water-vapor convection and heat transfer: model #br# establishment and validation[J]. , 2025, 44(8): 2202-2215.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0065 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I8/2202

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