冻土水热力耦合研究现状及进展

发布时间：2018-04-04 12:26

本文选题：冻土　切入点：水热力耦合模型　出处：《冰川冻土》2017年01期

【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。
[Abstract]:The study of three coupling fields of frozen soil water and heat is of great theoretical significance to solve the engineering problems in cold regions.The theoretical basis of the coupling of frozen soil water and heat is summarized. It is concluded that the current hypothesis of water migration driving force still can not explain the phenomenon of water migration, and the mechanism and criterion of ice separation still need to be deeply studied.The hydro-thermal coupling models of permafrost are classified and evaluated. It is found that although the hydrodynamic model can describe the phenomenon of hydrothermal migration well, it does not consider the discontinuous ice lens.The more complex rigid ice model takes into account the coupling phenomenon of water and heat transfer in the frozen edge, but there are a lot of parameters. The thermodynamic model describes the thermodynamics of frozen soil water and considers the pore suction from the microscopic point of view, but there are still many problems with the parameters.At the same time, the application of pre-thawing film theory to the thermo-mechanical coupling of frozen soil water is analyzed and prospected. It is considered that the energy, water migration driving force and migration rate can be described by pre-thawing film theory.Finally, based on the present situation and existing problems of the three fields coupling of frozen soil water and thermodynamics, the general conception of the study of frozen soil water thermal coupling is put forward: the general mathematical expression of the study is suitable for both steady and unsteady state in accordance with the actual situation.The dynamic change of physical parameters of frozen soil is studied, and the study of hydrothermal interaction of unsaturated soil during freeze-thaw process is introduced to realize the real coupling of water and heat. At the same time, the theory of pre-thawing film is strengthened on a large scale.Application of land surface processes and hydrothermal boundaries.
【作者单位】：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;中国科学院大学;
【基金】：中国科学院“百人计划”项目(张明义);中国科学院西部行动计划项目(KZCX2-XB3-19);中国科学院STS项目(HHS-TSS-STS-1502)资助国家自然科学基金项目(41471063) 冻土工程国家重点实验室自主研究课题(SKLFSE-ZT-23)
【分类号】：P642.14

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