冻土水热力耦合研究现状及进展

doi:10.7522/j.issn.1000-0240.2017.0013

摘要/Abstract

摘要： 开展冻土水热力三场耦合研究对解决寒区工程问题具有重要的理论指导意义。归纳了冻土水热力耦合的理论基础，认为目前的水分迁移驱动力假说仍然不能很好地解释水分迁移现象，分凝冰的形成机制及判据仍需进行深入的研究。分类和评价了常见的正冻土水热力耦合模型，发现流体动力学模型虽然能够很好地描述水热迁移现象，但未考虑非连续冰透镜体；而较复杂的刚冰模型虽然考虑了冻结缘内水热迁移耦合现象，但是参数众多；热力学模型从微观角度描述了冻土水热力并考虑孔隙吸力，但仍存在参数众多的问题。同时，对预融膜理论在冻土水热力耦合问题中的应用进行了分析和展望，认为可以借助预融膜理论对冻土水热力耦合中的能量、水分迁移驱动力以及迁移速率等进行描述。最后，基于冻土水热力三场耦合研究现状及存在的问题，提出了冻土水热力耦合研究的总体构想：研究与实际情况相符同时适用于稳态及非稳态的通用数学表达式，开展冻土物理学各个参数的动态变化研究，纳入非饱和土体在冻融过程中的水热力相互作用研究，实现水热力在真正意义上的耦合，同时，加强预融膜理论在大尺度、陆面过程以及水热边界等方面的应用研究。

关键词: 冻土, 水热力耦合模型, 预融膜理论

Abstract: Research on the coupled hydro-thermo-mechanical interaction of frozen soil is important for solving engineering problems in cold regions. In this paper, a general overview of the coupled hydro-thermo-mechanical of frozen soil is made. First, the basic theory of the coupled hydro-thermo-mechanical of frozen soil is summarized, it is found that the current hypothesis of the driving force of moisture transfer is limited to reveal the moisture transfer characteristics in freezing soil and the formation mechanisms and criterion of the segregated ice are still needed further study. Then, the existing coupled hydro-thermo-mechanical models are classified and evaluated. It is found that the fluid dynamics model is able to describe moisture-heat transfer well but have not consider the non-continuous ice lens; the rigid ice model has considered the coupled moisture-heat transfer in the frozen fringe but there are multitudinous parameters applied; the thermodynamic model is able to describe the coupled hydro-thermo-mechanical phenomena and pore suction from the microscopic view but also contains a lot of parameters. These coupled hydro-thermo-mechanical models reveal heat, moisture, stress and their coupling relations from different aspects, but the limitations are also obvious. Meanwhile, the pre-melted films theory can be introduced to explain the energy, driving force and the migration rate of the moisture in the coupled hydro-thermo-mechanical model of frozen soil. From the above discussions, it is proposed and suggested that coupled hydro-thermo-mechanical study of frozen soil should be taken, including establishing a conceptual model for steady and transient state, undertaking the dynamic study of the physical parameters of the frozen soils, studying the interaction among the moisture, heat and stress in freezing-thawing process of unsaturated soil, promoting the application research of the pre-melted films theory in the large-scale phenomenon, the land surface processes and hydro-thermal boundary conditions.

Key words: frozen soil, coupled hydro-thermo-mechanical model, pre-melted films theory

中图分类号:

P642.14

路建国, 张明义, 张熙胤, 裴万胜. 冻土水热力耦合研究现状及进展[J]. 冰川冻土, 2017, 39(1): 102-111.

LU Jianguo, ZHANG Mingyi, ZHANG Xiyin, PEI Wansheng. Review of the coupled hydro-thermo-mechanical interaction of frozen soil[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2017, 39(1): 102-111.

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