Study on the hydro-thermal-salt-mechanical coupling characteristics of sulfate saline soil under freeze-thaw cycles

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL Cold Regions Science and Technology Pub Date : 2024-08-06 DOI:10.1016/j.coldregions.2024.104289

Fengxi Zhou , Jinyin Yang , Wentao Ju , Zhixiong Zhou , Qiang Ma

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Abstract

The theoretical and experimental studies have been carried out on the water and salt migration and deformation characteristics of sulfate saline soil during freeze-thaw cycles. Based on the theory of unsaturated soil mechanics and the thermoelastic continuum and considering the influence of phase change within the pore on thermodynamic and hydrodynamic parameters, the multi-physical fields coupled model of hydro-thermal-salt-mechanical in unsaturated sulfate saline soil has been established. The variation processes of the temperature field, water field, salt field, and stress field of the soil during freeze-thaw cycles were analyzed, and the validity of the theoretical model was verified by indoor experiments. The results show that there are significant attenuation and hysteresis effects when heat is transferred in the soil during freeze-thaw cycles. The water content of migration in the soil increases with the height of the soil column, while the increment of migration water content decreases with the number of freeze-thaw cycles. The formation and dissolution of salt crystals from top to bottom and the sudden increase in the salt crystallization rate are mainly caused by variations in the solubility of the salt solutions due to temperature changes. The formation and dissolution of ice and salt crystals in the soil induce expansion and contraction, and the freeze-thaw cycle conditions have a significant effect on the expansion and residual deformation of the soil.

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冻融循环下硫酸盐盐土的水热盐力学耦合特性研究

针对硫酸盐盐渍土在冻融循环过程中的水盐迁移和变形特性，开展了理论和试验研究。以非饱和土力学和热弹性连续体理论为基础，考虑孔隙内相变对热力学和水动力学参数的影响，建立了非饱和硫酸盐盐土水热盐力学多物理场耦合模型。分析了冻融循环过程中土壤的温度场、水场、盐场和应力场的变化过程，并通过室内实验验证了理论模型的正确性。结果表明，冻融循环期间土壤中热量传递存在明显的衰减和滞后效应。土壤中的迁移含水量随着土柱高度的增加而增加，而迁移含水量的增量随着冻融循环次数的增加而减少。盐结晶自上而下的形成和溶解以及盐结晶速率的突然增加主要是由于温度变化导致盐溶液的溶解度变化造成的。土壤中冰和盐晶体的形成和溶解会引起膨胀和收缩，冻融循环条件对土壤的膨胀和残余变形有显著影响。

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来源期刊

Cold Regions Science and Technology 工程技术-地球科学综合

CiteScore

7.40

自引率

12.20%

发文量

209

审稿时长

4.9 months

期刊介绍： Cold Regions Science and Technology is an international journal dealing with the science and technical problems of cold environments in both the polar regions and more temperate locations. It includes fundamental aspects of cryospheric sciences which have applications for cold regions problems as well as engineering topics which relate to the cryosphere. Emphasis is given to applied science with broad coverage of the physical and mechanical aspects of ice (including glaciers and sea ice), snow and snow avalanches, ice-water systems, ice-bonded soils and permafrost. Relevant aspects of Earth science, materials science, offshore and river ice engineering are also of primary interest. These include icing of ships and structures as well as trafficability in cold environments. Technological advances for cold regions in research, development, and engineering practice are relevant to the journal. Theoretical papers must include a detailed discussion of the potential application of the theory to address cold regions problems. The journal serves a wide range of specialists, providing a medium for interdisciplinary communication and a convenient source of reference.