Study on the multi-field-coupling model of saline frozen soil considering ice and salt crystallization

IF 5.3 1区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Geotechnics Pub Date : 2024-03-11 DOI:10.1016/j.compgeo.2024.106209

Zean Xiao, Kangliang Li, Jieyun Duan, Shaofei Zhang

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Abstract

Sulfate soil, a typical saline soil in Qinghai Tibet Plateau, has the engineering characteristics of salt expansion and frost heave, which are seriously threatening the operation and safety of engineering buildings. Based on the phase diagram theory, we determined the functions of ice and hydrated salt in pore solution under different concentrations and temperatures. Then we further established a multi-field-coupling model of saline frozen soil considering ice and salt crystallization to simulate the water/salt migration process and the deformation law of saline soil in the cooling process. Compared with the results of unidirectional freezing test, we verified the reliability of the model, indicating that the model well reflected the development of water, temperature, salinity, and deformation of saline soil. Finally, we discussed the variation of each component in sodium sulfate soil, the change process of soil hydraulic conductivity, and the deformation mechanism according to the proposed numerical model. The results provide a theoretical reference for the engineering application of a multi-field-coupling model of saline soil in cold regions.

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考虑冰与盐结晶的盐碱冻土多场耦合模型研究

硫酸盐土是青藏高原典型的盐渍土，具有盐膨胀和冻胀的工程特性，严重威胁工程建筑物的运行和安全。基于相图理论，我们确定了不同浓度和温度下孔隙溶液中冰和水合盐的功能。然后进一步建立了考虑冰盐结晶的盐渍冻土多场耦合模型，模拟了冷却过程中水盐迁移过程和盐渍土的变形规律。与单向冻结试验结果相比，验证了模型的可靠性，表明该模型较好地反映了盐渍土水分、温度、盐度和变形的发展规律。最后，根据提出的数值模型，讨论了硫酸钠土壤中各组分的变化、土壤导水性的变化过程以及变形机理。研究结果为寒冷地区盐渍土多场耦合模型的工程应用提供了理论参考。

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来源期刊

Computers and Geotechnics 地学-地球科学综合

CiteScore

9.10

自引率

15.10%

发文量

438

审稿时长

45 days

期刊介绍： The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.