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A model for evaluating settlement of clay subjected to freeze-thaw under overburden pressure

机译：覆土压力作用下冻融黏土沉降评估模型

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摘要

The settlement after freeze-thaw (F-T) is of great concern when artificial ground freezing is applied in soft soils. This paper focuses on the assessment of the post-freeze settlement of saturated clay under overburden pressure. First presented was laboratory data including temperature and deformation of specimens subjected to unidirectional F-T with or without overburden pressure in an open system. It then discusses the variation of the compressibility of specimens in terms of pre-consolidation pressure, compression index, and swell index along the specimen height. It is concluded that the thaw process can be decoupled from the consolidation process for post-freeze settlement evaluation since the time required for the frozen soil to thaw is much shorter than needed to consolidate. Variation of the effective stress and void ratio during thaw and consolidation processes in the frozen region was found to be very different from that in the unfrozen region, which is illustrated by detailed stress paths. A model is proposed for assessing the post-freeze settlement, which consists of the settlement induced by phase and soil structural change due to thaw without overburden pressure and the settlement caused by consolidation under overburden pressure. This model hinges on the residual stress in the frozen region when thawed without overburden pressure. The residual stress back-calculated based on the laboratory experimental settlement results agrees well with previous studies, which serves as an indirect validation of the proposed model. In the end, an example is provided to demonstrate how to apply the proposed model in a subway cross-passage constructed by artificial ground freezing.
机译：当在软土中进行人工地面冻结时，冻融后的沉降非常重要。本文的重点是评估上覆压力下饱和黏土的冻结后沉降。首先介绍的是实验室数据，包括温度和试样在开放系统中承受或不施加上覆压力时的单向F-T变形。然后，讨论了根据固结前压力，压缩指数和沿试样高度的膨胀指数，试样的可压缩性的变化。结论是，解冻过程可以与固结过程解耦，以进行冷冻后沉降评估，因为冻土解冻所需的时间比固结所需的时间短得多。发现在冰冻区的融化和固结过程中有效应力和空隙率的变化与未冰冻区的变化非常不同，这通过详细的应力路径说明。提出了一种评价冻融后沉降的模型，该模型包括由于没有上覆压力而解冻引起的相变和土壤结构变化所引起的沉降，以及由上覆压力引起的固结引起的沉降。该模型取决于在没有覆盖压力的情况下解冻时冻结区域中的残余应力。根据实验室实验沉降结果反算的残余应力与先前的研究非常吻合，可以作为对所提出模型的间接验证。最后，提供了一个示例来演示如何在通过人工地面冻结构建的地铁交叉通道中应用所提出的模型。

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  • 来源
    《Cold regions science and technology》 |2020年第5期|102996.1-102996.10|共10页
  • 作者

    Fan Wenhu; (Joey) Yang Zhaohui; Yang Ping;

  • 作者单位

    Nanjing Forestry Univ Sch Civil Engn 159 Longpan Rd Nanjing 210037 Jiangsu Peoples R China|Univ Alaska Anchorage Dept Civil Engn 3211 Providence Dr Anchorage AK 99508 USA;

    Univ Alaska Anchorage Dept Civil Engn 3211 Providence Dr Anchorage AK 99508 USA;

    Nanjing Forestry Univ Sch Civil Engn 159 Longpan Rd Nanjing 210037 Jiangsu Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Freeze-thaw; Settlement; Consolidation; Clay; Stress path;

    机译：冻融;沉降;合并;粘土;应力路径;

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