Pot-cover effect in permafrost embankment: Laboratory experimental reproduction and prevention measures simulation

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2025-04-27 DOI:10.1016/j.coldregions.2025.104529

Yuefeng Liu , Mingli Zhang , Dongmiao Hao , Zhi Wen , Ruiling Zhang , Wei Feng

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Abstract

Under the influence of large temperature differences in permafrost regions, liquid water and vapor in the soil accumulate at the bottom of the impermeable layer, forming a pot-cover effect. The phenomenon leads to increased embankment filler porosity, reduces bearing capacity, and exacerbated frost heave and thaw settlement issues. However, the pot-cover effect in embankment in permafrost regions has not yet been verified. This study conducted hydro-thermal transfer experiments using a moisture migration tester and combined numerical simulations to study the migration and accumulation processes of moisture within embankment in permafrost regions, aiming to verify the existence of the pot-cover effect in embankments. Furthermore, based on the water-vapor-heat coupling model, this study explores prevention measures for the pot-cover effect through numerical simulation. The results indicate that: (1) the volumetric liquid water content within the soil sample depth range of 0 cm to 30 cm increased by 2.2 % to 4.9 %, confirming the presence of the pot-cover effect in permafrost regions. (2) both liquid water and vapor migrate upwards during the freezing period and downwards during the thawing period. The vapor flux exceeds that of liquid water during freezing, indicating that the moisture accumulation is mainly related to the vapor migration within the soil. (3) when an impermeable layer is placed at a depth of 0.5 m in embankment, the average volumetric liquid water content between 2.5 m and 0.5 m is 15.1 %, closely matching the initial value of 15 %. Thus, installing an impermeable layer at 0.5 m effectively mitigates the pot-cover effect in embankments

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多年冻土路基壶盖效应：实验室实验再现及预防措施模拟

在多年冻土区较大温差的影响下，土壤中的液态水和水蒸气在不透水层底部积聚，形成锅盖效应。这种现象导致路堤填料孔隙率增加，承载能力降低，并加剧了冻胀和融化沉降问题。然而，多年冻土区路基的壶盖效应尚未得到验证。本研究利用水分迁移仪进行水热传递实验，并结合数值模拟研究多年冻土区路堤内水分的迁移和积累过程，旨在验证路堤中罐盖效应的存在。此外，基于水-汽-热耦合模型，通过数值模拟探讨了锅盖效应的防治措施。结果表明：(1)在0 ~ 30 cm土壤样品深度范围内，体积液态水含量增加2.2% ~ 4.9%，证实了多年冻土区存在壶盖效应。(2)液态水和水蒸气在冻结期向上迁移，在解冻期向下迁移。冻结过程中水汽通量大于液态水通量，说明水分积累主要与土壤内部水汽迁移有关。(3)在路基0.5 m深度处设置防渗层时，2.5 m ~ 0.5 m之间的平均体积液态水含量为15.1%，与初始值15%接近。因此，在0.5 m处安装防渗层可以有效地减轻堤防的罐盖效应

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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.