A systematic investigation of the freezing process of silty clay through unidirectional stepwise freezing method combined with digital imaging processing technology

IF 3.8 2区 工程技术 Q1 ENGINEERING, CIVIL Cold Regions Science and Technology Pub Date : 2024-10-02 DOI:10.1016/j.coldregions.2024.104340
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Abstract

Soil freezing represents a complex thermo-hydro-mechanical coupling process that encompasses a range of physical and mechanical phenomena, such as heat transfer, moisture migration, cryostructure development, ice lens segregation, frost heave, and consolidation, all of which interact and influence one another throughout the freezing process. This study conducted a unidirectional stepwise freezing test, comprising three distinct freezing stages, to investigate the freezing behavior of Qinghai-Tibet silty clay using digital imaging processing technology (DIPT), which includes an image acquisition system and a digital image processing system. The results demonstrate that the stepwise freezing test provides a more comprehensive insight into the physical and mechanical processes occurring during unidirectional soil freezing. At various stages of freezing, the temperature distribution within the sample achieves a linear stabilization, with the frozen zone exhibiting a slightly larger extent compared to the unfrozen zone. The longitudinal section of the sample developed layered cryogenic cracks, whereas the horizontal section revealed interconnected cryogenic polygonal cracks of varying sizes, which facilitated moisture migration and ice segregation. Furthermore, ice lenses can segregate within a broad temperature range below the soil freezing point in the frozen zone, resulting in frost heave within the frozen zone and consolidation of the unfrozen zone. This study proposes an experimental method to clarify the complex phenomenon and mechanisms of frost heave during soil freezing.
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结合数字图像处理技术的单向分步冻结法对淤泥质粘土冻结过程的系统研究
土壤冻结是一个复杂的热-水-机械耦合过程,包括一系列物理和机械现象,如热传导、水分迁移、冰冻结构发展、冰晶体离析、冻胀和固结等,所有这些现象在整个冻结过程中相互作用、相互影响。本研究利用数字图像处理技术(DIPT)(包括图像采集系统和数字图像处理系统)对青藏淤泥质粘土的冻结行为进行了单向分步冻结试验,包括三个不同的冻结阶段。结果表明,分步冻结试验能更全面地了解土壤单向冻结过程中发生的物理和力学过程。在冻结的不同阶段,样品内部的温度分布实现了线性稳定,与未冻结区相比,冻结区的范围略大。样本的纵向断面出现了分层的低温裂缝,而横向断面则出现了相互连接的大小不等的多边形低温裂缝,这有利于水分迁移和冰析出。此外,冰透镜体可在冻结区低于土壤冰点的较大温度范围内发生离析,导致冻结区内的冻胀和未冻结区的固结。本研究提出了一种实验方法,以阐明土壤冻结期间冻胀的复杂现象和机理。
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来源期刊
Cold Regions Science and Technology
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.
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