Numerical study on the hydro-thermal-chemical–mechanical coupling mechanism in sulfate saline soil under freeze–thaw cycles

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
Jing Zhang , Yuanming Lai , Mingyi Zhang , Shuangyang Li , Dongqing Li , Zhemin You
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Abstract

Water-heat-salt migration inevitably leads to instability and failure in roads, slopes, channels, and tower foundations in sulfate saline soil regions undergoing freeze–thaw (F-T) cycles, severely compromising the safety and stability of long-term operations in cold region engineering. F-T tests were performed on sulfate saline soil under different F-T cycle modes to investigate the impact of F-T cycle frequency and cooling duration on water-salt transfer and soil deformation. This study revealed the coupled mechanism of water-heat-salt-mechanics in sulfate saline soil under variable F-T conditions and established a hydro-thermal-chemical–mechanical coupled model. The study indicates that the progression of salt spatiotemporal distribution during F-T cycles are initial salt accumulation in the frozen zone near the freezing front, an upward shift of the salt peak, salts redistribution as subflorescence and efflorescence, and surface salt accumulation. These factors are closely related to soil deformation. Longer cooling durations promote salt accumulation near the freezing front, while shorter durations and more F-T cycles encourage salt migration to the surface layer. The model’s reliability is validated by the good agreement between calculated results and experimental data. Understanding these multiphase-multifield coupling mechanism in sulfate saline soils can help address engineering issues associated with salt-frost heave.
冻融循环条件下硫酸盐盐土的水热-化学-力学耦合机制数值研究
水热盐迁移不可避免地会导致硫酸盐盐土地区的道路、边坡、渠道和塔基在冻融循环(F-T)过程中失稳和破坏,严重影响寒冷地区工程长期运行的安全性和稳定性。研究人员对不同冻融循环模式下的硫酸盐盐渍土进行了冻融试验,以研究冻融循环频率和冷却持续时间对水盐传递和土壤变形的影响。该研究揭示了不同 F-T 条件下硫酸盐盐土的水-热-盐-力学耦合机理,建立了水热-化学-力学耦合模型。研究表明,F-T 循环过程中盐分时空分布的变化过程为:冻结前沿附近冻结带的初始盐分积累、盐峰上移、盐分重新分布为亚沉积和渗出以及表层盐分积累。这些因素与土壤变形密切相关。较长的冷却时间会促进盐分在冻结前沿附近积累,而较短的冷却时间和较多的 F-T 循环则会促进盐分向表层迁移。计算结果与实验数据之间的良好一致性验证了模型的可靠性。了解硫酸盐盐土中的这些多相多场耦合机制有助于解决与盐冻隆起相关的工程问题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Computers and Geotechnics
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.
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