A TOUGH-FEMM based cryogenic THM coupled model and its application to cold-region tunnels

IF 4.2 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Engineering Analysis with Boundary Elements Pub Date : 2024-10-18 DOI:10.1016/j.enganabound.2024.105994

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Abstract

The frost damage of rock mass poses a serious threat to the safety and stability of tunnels in cold regions, and the related thermo-hydro-mechanical (THM) coupling model under low-temperature conditions has been a key focus of research. This paper proposed a cryogenic THM coupled model (TOUGH-FEMM) to study the frost heave behavior of cold-region tunnels. Key issues including heat transfer, thermal stress, water-ice phase transition, unfrozen water, frost heave deformation, and ice-rock interaction are systematically addressed in the proposed model. Specifically, frost pressure in pores and cracks is derived separately to better simulate the ice expansion effect in rock masses. The proposed model is first validated against an experimental test and then applied to a practical cold-region tunnel to reveal the evolution of temperature, frost pressure and frost heave fields, as well as the tunnel stability. Moreover, the effects of cracks and frost damage on tunnel stability under freeze-thaw cycles are discussed. The work detailed herein provides an efficient tool for the THM coupled process in cold-region tunnels.

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基于 TOUGH-FEMM 的低温 THM 耦合模型及其在冷区隧道中的应用

岩体冻害对寒区隧道的安全和稳定性构成严重威胁，低温条件下的相关热工水力学（THM）耦合模型一直是研究的重点。本文提出了一种低温 THM 耦合模型（TOUGH-FEMM）来研究寒区隧道的冻胀行为。该模型系统地解决了传热、热应力、水冰相变、解冻水、冻浪变形以及冰岩相互作用等关键问题。具体而言，孔隙和裂缝中的霜压被分别推导出来，以更好地模拟岩体中的冰膨胀效应。提出的模型首先通过实验验证，然后应用于实际的寒区隧道，揭示了温度场、冻压场和冻浪场的演变，以及隧道的稳定性。此外，还讨论了冻融循环下裂缝和冻害对隧道稳定性的影响。本文详述的工作为冷区隧道的 THM 耦合过程提供了有效工具。

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来源期刊

Engineering Analysis with Boundary Elements 工程技术-工程：综合

CiteScore

5.50

自引率

18.20%

发文量

368

审稿时长

56 days

期刊介绍： This journal is specifically dedicated to the dissemination of the latest developments of new engineering analysis techniques using boundary elements and other mesh reduction methods. Boundary element (BEM) and mesh reduction methods (MRM) are very active areas of research with the techniques being applied to solve increasingly complex problems. The journal stresses the importance of these applications as well as their computational aspects, reliability and robustness. The main criteria for publication will be the originality of the work being reported, its potential usefulness and applications of the methods to new fields. In addition to regular issues, the journal publishes a series of special issues dealing with specific areas of current research. The journal has, for many years, provided a channel of communication between academics and industrial researchers working in mesh reduction methods Fields Covered: • Boundary Element Methods (BEM) • Mesh Reduction Methods (MRM) • Meshless Methods • Integral Equations • Applications of BEM/MRM in Engineering • Numerical Methods related to BEM/MRM • Computational Techniques • Combination of Different Methods • Advanced Formulations.