A multi-field coupled model contained volumetric strain for unsaturated frozen soil and thermal-hydro-mechanical evolution characteristics of permafrost tunnel

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2025-04-02 DOI:10.1016/j.coldregions.2025.104510

Hongyu Huang , Yuanfu Zhou , Xiaoqing Suo , Jianhui Deng , Zihan Zhou

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引用次数: 0

Abstract

The entrance section of permafrost tunnels in cold regions is particularly vulnerable to frost damage caused by complex thermal-hydro-mechanical (THM) interactions in unsaturated frozen soils. The effects of temperature-dependent volumetric strain variations across different stratum materials on heat and moisture transport are often neglected in existing THM coupling models. In this study, a novel THM coupled model for unsaturated frozen soil integrating volumetric strain correction is proposed, which addresses bidirectional interactions between thermal-hydraulic processes and mechanical responses. The model was validated through laboratory experiments and subsequently applied to the analysis of the Yuximolegai Tunnel. The results indicate that distinct “layered” ice-water distribution patterns are formed in shallow permafrost under freeze-thaw cycles, driven by bidirectional freezing and water migration. Critical mechanical responses were observed, including a shift in maximum principal stress from the invert (1.40 MPa, frozen state) to the crown (5.76 MPa, thawed state), and periodic lining displacements (crown > invert > sidewalls). Frost damage risks are further quantified by the spatial-temporal zoning of ice-water content-sensitive regions. These findings advance unsaturated frozen soil modeling and provide theoretical guidance for frost-resistant tunnel design in cold regions.

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寒冷地区永久冻土隧道的入口段特别容易受到非饱和冻土中复杂的热-水-机械（THM）相互作用造成的冻害。在现有的热-水-力学耦合模型中，不同地层材料随温度变化的体积应变对热量和水分传输的影响往往被忽视。本研究提出了一种新的非饱和冻土 THM 耦合模型，该模型集成了体积应变校正，解决了热-水力过程与力学响应之间的双向相互作用问题。该模型通过实验室实验进行了验证，随后应用于玉溪莫勒盖隧道的分析。结果表明，在双向冻结和水迁移的驱动下，浅层冻土在冻融循环下形成了独特的 "分层 "冰水分布模式。观察到了关键的机械反应，包括最大主应力从顶面（1.40 兆帕，冻结状态）转移到顶面（5.76 兆帕，解冻状态），以及周期性的衬砌位移（顶面> 顶面> 侧壁）。冰水含量敏感区域的时空分区进一步量化了冻害风险。这些发现推进了非饱和冻土模型的建立，并为寒冷地区的抗冻隧道设计提供了理论指导。

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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.