硫酸盐影响下土壤盐冻胀的水热化学动力学反馈：冻融循环实验的启示

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2025-09-16 DOI:10.1016/j.coldregions.2025.104693

Dongwei Zhang , Jing Zhang , Mingyi Zhang , Yuanming Lai , Zhimin Chen , Yanyan Chen

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引用次数: 0

摘要

冻融循环（FTC）显著加剧了硫酸盐影响土壤的盐冻胀（SFH），威胁着盐碱化寒区工程项目的长期安全和稳定。在不同初始含水率、含盐量和温度幅值的硫酸盐影响土壤上进行了FTC试验，分析了湿-热-溶质转移和SFH特征。研究确定了水盐含量的变化对固结水h和残余变形的影响，揭示了水盐再分布对固结水h的反馈机制。研究表明，在冻融过程中，受硫酸盐影响的土壤在冻结区形成一个盐峰。初始含水率的增加促进了水溶质迁移，而高含盐量则抑制了盐的析出。FTC后，盐的再分配随初始水分和盐含量的变化而变化。较高的含水率加速了水和盐向冻结区的迁移，造成更大的盐积累和更明显的残余变形。含盐量的增加增加了冻结区盐的总量，增强了SFH和残余变形。冷端温度的降低增加了水分和溶质的迁移，进一步促进了冻结区盐和水的积累，导致SFH更加显著。土壤变形与水分-溶质迁移、冰-水相变和盐沉淀-溶解过程有关。这种链状的破坏过程始于迁移和积累，随后是动态再分配、孔隙富集和结晶引起的破坏。研究揭示了冻融期硫酸盐盐渍土的水-热-化学-力学耦合作用，为寒区工程项目提供理论依据，提高盐渍地区工程项目全生命周期的安全性和稳定性。

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Feedback of hydro-thermal-chemical dynamics on salt-frost heave in sulfate-affected soils: Insights from freeze-thaw cycle experiments

Freeze-thaw cycles (FTC) significantly intensify salt-frost heave (SFH) in sulfate-affected soils, threatening the long-term safety and stability of engineering projects in salinized cold regions. The FTC experiments were conducted on sulfate-affected soils with varying initial moisture content, salt content, and temperature amplitude to analyze moisture-heat-solute transfer and the SFH characteristics. The study identified how variations in water and salt content affect the SFH and residual deformation, revealing the feedback mechanism of water and salt redistribution on the SFH. The study shows that, a salt peak forms in the freezing zone of sulfate-affected soils during the FTC. Increased initial moisture content promotes moisture-solute migration, while higher salt content inhibits salt precipitation. After FTC, salt redistribution varies with changes in initial moisture and salt content. Higher moisture content accelerates the migration of water and salts to the freezing zone, causing greater salt accumulation and more pronounced residual deformation. Increased salt content raises the total amount of salts in the freezing zone, enhancing the SFH and residual deformation. Lowering the temperature at the cold end increases the migration of moisture and solutes, further promoting salt and water accumulation in the freezing zone and resulting in more significant the SFH. Soil deformation is linked to moisture-solute migration, ice-water phase transition, and salt precipitation-dissolution process. This chain-like failure process starts with migration and accumulation, followed by dynamic redistribution, pore enrichment, and crystallization-induced damage. The study reveals the coupled hydro-thermal-chemical-mechanical (HTCM) interaction in sulfate saline soil during the FTC, providing a theoretical foundation for engineering projects in cold regions, and improving the safety and stability of such projects throughout their lifecycle in saline-affected areas.

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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.