考虑结晶过程的非饱和硫酸盐盐渍土多场热力学模型

IF 5.3 1区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers and Geotechnics Pub Date : 2025-04-07 DOI:10.1016/j.compgeo.2025.107251

Bing Bai , Bixia Zhang , Yanjie Ji , Yongchen Zong

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引用次数: 0

摘要

基于热力学耗散理论，建立了一种新的热-水-机械-化学（THMC）耦合模型，揭示了非饱和硫酸盐-盐渍土在冷却结晶过程中的复杂行为。该模型量化了结晶过程中的能量传递和耗散，并介绍了硫酸盐结晶量的计算方法。它复杂地捕获了结晶、孔隙水压力、结晶压力和体积膨胀之间的相互依赖关系，同时也考虑了相变对热传导的潜热的动态反馈。通过实验数据验证了模型的可靠性。数值模拟研究了冷却路径、导热系数、初始含盐量和初始孔隙率对结晶行为和力学性能的影响。该模型为优化硫酸盐盐渍土的工程设计和设施维护提供了理论支持。

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A thermodynamic multi-field model for unsaturated sulfate-saline soils considering crystallization process

A novel thermo-hydro-mechanical-chemical (THMC) coupling model grounded in thermodynamic dissipation theory was established to unravel the intricate behavior of unsaturated sulfate-saline soils during cooling crystallization. The model quantifies energy transfer and dissipation during crystallization and introduces a method to calculate the amount of sulfate crystallization. It intricately captures the interdependencies between crystallization, pore water pressure, crystallization pressure and volumetric expansion, while also accounting for the dynamic feedback of latent heat from phase transitions on heat conduction. The reliability of the model was validated through experimental data. Numerical simulations explored the effects of cooling paths, thermal conductivity, initial salt content and initial porosity on the crystallization behavior and mechanical properties. The model provides theoretical support for optimizing the engineering design and facility maintenance of sulfate-saline soils.

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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.