季节性冰冻地区土坡热-水-机械耦合过程研究

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2024-11-03 DOI:10.1016/j.coldregions.2024.104356

Qimin Chen , Yong Liu , Yang Wang , Libin Su , Yonggang Cheng

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引用次数: 0

摘要

冻融循环严重影响季节性冰冻地区的边坡稳定性，对基础设施的功能和安全构成严重威胁。本研究开发了冻土的热-水-力学（THM）耦合模型，该模型考虑了水迁移、水冰相变、地下水补给、冻胀和融冻沉降变形。该模型的准确性和可靠性已根据土柱测试结果得到验证。研究了冻融过程中土坡温度、含水量和位移的变化。结果表明，随着气温的变化，水热传递和变形主要发生在边坡浅层土壤中。坡肩和坡面的温度波动比坡脚和坡顶更为明显。由于温度梯度，水从未冻区向冻结前沿迁移，导致冻结区含水量增加。坡肩的温度波动最大，导致水迁移增加，变形加大。地下水位的上升增加了坡脚和坡底的总含水量，加剧了冻胀和融冻沉降变形，并提供了合理的地下水位控制区间。该研究阐明了季节性冻土边坡的热-水-机械耦合过程和变形机理，总结了其破坏模式，为寒冷地区土质边坡的稳定性评估和灾害防治提供了参考。

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Investigation of coupled thermo-hydro-mechanical processes on soil slopes in seasonally frozen regions

Freeze-thaw cycles significantly affect slope stability in seasonally frozen regions, posing serious threats to the functionality and safety of infrastructure. This study developed a coupled thermo-hydro-mechanical (THM) model of frozen soils that accounts for water migration, water-ice phase change, groundwater recharge, frost heave and thaw settlement deformation. The accuracy and reliability of the model was verified based on soil column test results. The change of temperature, water content, and displacement of a soil slope during freeze-thaw process was investigated. The results show that the water-heat transfer and deformation mainly occur in the shallow soils of the slope with changes in air temperature. The temperature fluctuations at the shoulder and face of the slope are more pronounced than those at the toe and crest of the slope. Water migration from the unfrozen zone to the freezing front due to the temperature gradient results in an increase in water content in the frozen zone. The slope shoulder exhibits the largest temperature fluctuations, leading to increased water migration and greater deformation. The rising groundwater table increases the total water content at the slope toe and base, exacerbating the frost heave and thaw settlement deformation, and reasonable groundwater table control intervals are provided. This study elucidates the thermo-hydro-mechanical coupling process and deformation mechanism of seasonally frozen soil slopes, and summarizes the failure modes, which provides a reference for the stability assessment and disaster prevention of soil slopes in cold regions.

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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.