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正冻土冻结缘研究现状

王  丹1,2,杨成松1,马  巍1,张莲海1   

  1. 1. 中国科学院西北生态环境资源研究院冻土工程国家重点实验室
    2. 中国科学院大学
  • 收稿日期:2018-04-09 修回日期:2018-11-07 出版日期:2020-01-03 发布日期:2020-01-03
  • 通讯作者: 杨成松
  • 基金资助:
    国家自然科学基金重点项目(41630636);国家重点研发计划项目(2017YFC0405101);国家自然科学基金项目(41501072)资助

The research status of frozen fringe in freezing soils

WANG Dan1,2, YANG Chengsong1, MA Wei1, ZHANG Lianhai1   

  • Received:2018-04-09 Revised:2018-11-07 Online:2020-01-03 Published:2020-01-03

摘要: 冻胀给寒区工程建设带来了极大的危害,伴随着水分迁移、重分布及冰水相变等现象,是冻土研究的重难点。冻结缘作为温度场、水分场和应力场三场耦合作用的结果,是冰分凝的水源补给站,冰水相变发生的剧烈区域以及水分迁移的必经之路,具有重要的研究意义,也是深入认识冻胀机理的基础。因而,通过系统地综述了冻结缘的宏观、微观形成发育过程,探讨了冻结过程中冻结缘的结构特征,概述了其参数特征,阐述了冻结缘的模型构建,得出冻胀机理的研究根本是对冻土微观机制的探讨。同时提出了冻结缘研究的重点,即对冻结缘的研究应回归到试验研究,利用新型测试技术深入对冻结缘微结构的观测,结合物理参数及结构性参数变化构建耦合的冻结缘模型,从而揭示其热力学机理,为冻胀机制分析、冻土精确预报提供理论支撑。

关键词: 正冻土, 冻结缘, 微结构, 特征参数, 冻结缘模型

Abstract: Frost heave has a great influence on construction and projects in cold regions. This phenomenon is closely related to process of its thermodynamics, which involving the mechanisms of phase change process between water and ice, ice segregation and water migration. Especially, frozen fringe becomes a key factor to understand the mechanisms of frost heave,which as the water supply station of ice segregation, the region of ice and water phase change and the path of water migration. However, the mechanism study of frozen fringe has currently become a significant challenge. Herein, a detailed review is given about the phenomena, mechanisms, microstructures, characteristic parameters and models of the frozen fringe. For further research of frost heave, it is urgent to continue to strengthen the experimental study, to develop a new test technique to observe the microstructures of the frozen fringe, and to build better a model with the change of characteristic parameters. Study of frozen fringe is reliable to provide theoretical support for analyzing frost heave mechanisms and accurately predicting frozen soils.

Key words: Freezing soil, Frozen fringe, Microstructures, Characteristic parameters, Frozen fringe model