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An investigation of pore water pressure and consolidation phenomenon in the unfrozen zone during soil freezing

机译：土壤冻结过程中非冻区孔隙水压力和固结现象的研究

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摘要

Accurate modeling of soil deformation depends on the consideration of both frost heave deformation in the frozen zone and consolidation deformation in the unfrozen zone. Pore water pressure investigations are important for revealing these two deformation behaviors. Herein, we aim to reveal the consolidation process by measuring and analyzing changes in pore water pressure in the unfrozen zone. Using a custom-made pore water pressure gauge, we performed a series of real-time pore water pressure measurements in the unfrozen zone of silty clay and sandy soil samples that were exposed to closed and open freezing systems. The results show that the pore water pressure in the unfrozen zone generally increases at first and then decreases. The temperature changes in the unfrozen zone have no significant influence on the changes in pore water pressure, and the variations of the pore water pressure are mainly controlled by the stress and hydraulic boundary (changes in pore water pressure) conditions at the freezing front. Furthermore, changes in the pore water pressure are affected by several parameters, including soil type, water supply condition, initial moisture content, measured soil layer depth, and hydraulic conductivity. Soil consolidation is mainly caused by change in effective stress, which results from increase in total stress or decrease in pore pressure. Based on the observed pore water pressure variations and its numerical simulations, we propose that consolidation in the unfrozen zone during soil freezing includes compression-induced consolidation, which results from an increase in frost heaving stress, and vacuum induced consolidation, which results from a decrease in pore water pressure. Each consolidation pattern plays an important role in the different stages of soil freezing. Compression-induced consolidation primarily occurs during the early stage of soil freezing, while vacuum-induced consolidation mainly occurs during the later stage of soil freezing. (C) 2016 Elsevier B.V. All rights reserved.
机译：对土壤变形的准确建模取决于对冻结区冻胀变形和未冻结区固结变形的考虑。孔隙水压力研究对于揭示这两种变形行为很重要。在这里，我们旨在通过测量和分析未冻结区域中孔隙水压力的变化来揭示固结过程。使用定制的孔隙水压力计，我们在暴露于封闭和开放式冷冻系统的粉质粘土和沙质土壤样品的未冻结区域中进行了一系列实时孔隙水压力测量。结果表明，未冻结区的孔隙水压力一般先升高后降低。未冻结区的温度变化对孔隙水压力的变化没有显着影响，孔隙水压力的变化主要受冻结前沿的应力和水力边界（孔隙水压力的变化）条件控制。此外，孔隙水压力的变化受几个参数的影响，包括土壤类型，供水条件，初始含水量，测得的土壤层深度和水力传导率。土壤固结主要是由有效应力的变化引起的，有效应力的变化是由于总应力的增加或孔隙压力的减小而引起的。基于观测到的孔隙水压力变化及其数值模拟，我们建议在土壤冻结过程中在未冻融区的固结包括：压缩引起的固结（由于霜冻胀应力的增加而导致）和真空引起的固结（由减少的结霜而引起）在孔隙水压力。每个固结模式在土壤冻结的不同阶段都起着重要作用。压缩诱导的固结主要发生在土壤冻结的早期，而真空诱导的固结主要发生在土壤冻结的后期。 （C）2016 Elsevier B.V.保留所有权利。

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  • 来源
    《Cold regions science and technology》 |2016年第10期|21-32|共12页
  • 作者

    Zhang Lianhai; Ma Wei; Yang Chengsong; Wen Zhi; Dong Sheng;

  • 作者单位

    Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China;

    Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China;

    Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China;

    Beijing Univ Technol, Coll Civil Engn, Beijing 100049, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Pore water pressure; Vacuum-induced consolidation; Frost heaving stress; Water expulsion; The unfrozen zone; Frost heave;

    机译：孔隙水压力;真空固结;冻胀应力;排水;未冻结带;冻胀;

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