Moisture migration within the melting laps during construction controls frost heaving damage of lining in permafrost tunnels

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2025-09-18 DOI:10.1016/j.tust.2025.107107

Hailiang Jia , Kangyong Xiao , Yibo Hao , Long Jin , Yao Wei , Xianjun Tan

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引用次数: 0

Abstract

Frost heaving damage is a typical hazard in tunnels constructed in cold regions, among which frost heave induced by the freezing expansion of surrounding rock stands as one of the primary factors leading to stress concentration and even cracking failure in lining structures. Under the influence of construction thermal disturbances, the thawing of surrounding rock is accompanied by moisture redistribution, where the characteristics of water distribution play a critical role in governing frost heave. This study establishes a thermal-hydro-mechanical (THM) coupled model for melting laps, validated through the Jiangluling Tunnel case. Integrating laboratory freezing tests on gravel soils with numerical simulations, we investigate moisture migration impacts on lining frost heaving damage under construction thermal disturbance and operational refreezing. The results indicate: (1) The numerical simulations align closely with field monitoring data, validating the accuracy of the model for this project. (2) Pore ice formation without moisture migration generates negligible frost heave pressure. (3) Moisture redistribution during construction creates water-enriched zones at tunnel flanks, causing tensile stress concentration (peak 6.008 MPa) at lining sidewalls. (4) The tensile stress at the inner walls of the lining initially increases gradually, then rises rapidly, and finally stabilizes. Mechanistic analysis reveals that moisture redistribution within the melting laps under construction thermal disturbance establishes essential material precondition for frost heave. During operational phases, initial frost heave develops in surrounding rocks, which subsequently subjected to seasonal freeze–thaw cycles triggers cumulative frost heave effects. Consequently, maximum tensile stress in lining structures demonstrates progressive annual escalation. This research provides theoretical basis for frost-resistant lining design in permafrost tunnels.

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融化圈施工过程中的水分迁移控制了多年冻土隧道衬砌的冻胀破坏

冻胀损伤是寒冷地区隧道施工的一种典型危害，其中围岩冻胀引起的冻胀是导致衬砌结构应力集中甚至开裂破坏的主要因素之一。在施工热扰动的影响下，围岩的融化过程伴随着水分的再分布，其中水分的分布特征对控制冻胀起着至关重要的作用。本文建立了熔覆层的热-水-力耦合模型，并通过江鹿岭隧道实例进行了验证。将室内冻结试验与数值模拟相结合，研究了施工热扰动和操作再冻结条件下，水分迁移对衬砌冻胀损伤的影响。结果表明：(1)数值模拟结果与现场监测数据吻合较好，验证了模型的准确性。(2)无水分迁移的孔隙结冰产生的冻胀压力可以忽略不计。(3)施工过程中的水分再分配在隧道侧翼形成富水区，导致衬砌侧壁拉应力集中，峰值为6.008 MPa。(4)衬砌内壁拉应力先逐渐增大，然后迅速上升，最后趋于稳定。力学分析表明，在施工热扰动作用下，融层内的水分再分布是冻胀发生的重要物质前提。在施工阶段，围岩产生初始冻胀，随后受到季节性冻融循环的影响，引发累积冻胀效应。因此，衬砌结构的最大拉应力表现出逐年递增的趋势。该研究为多年冻土隧道的抗冻衬砌设计提供了理论依据。

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

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.