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| Relationship between the frost-heaving coefficient and the frost-heaving#br#
rate of permafrost soils considering the ice water phase transformation#br#
based on elastic mechanics |
| WANG He，GUO Chunxiang，WU Yaping，JIANG Daijun |
(School of Civil Engineering，Lanzhou Jiaotong University，Lanzhou，Gansu 730000，China)
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Abstract In the numerical simulation of the thermal-force coupling of permafrost soils，the frost expansion coefficient is the key thermal physical parameter. At present，the negative thermal expansion coefficient is taken by most scholars as the frost expansion coefficient，and only the change of the temperature is considered. However，the frost expansion coefficient is actually affected by many factors. Based on the theory of elastic mechanics and without considering the frost heave caused by water migration，the relationship between the frost heave rate and the frost heave coefficient of soil body during freezing process caused by in-situ water freezing was studied. Taking into account the factors such as the temperature，the poisson ratio of soil body and the phase change rate of ice water under freezing state of different soil materials，a formula between the frost heave rate and the frost heave coefficient was derived. Comparisons between the developed method and the traditional calculation method were performed based on the basic physical parameters of soil mass measured in Qingshuihe area of Qinghai—Tibetan Plateau. As is shown by the results，the method considering multiple factors has smaller errors and can be used to accurately simulate the frost heaving process caused by water freezing in situ.
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2018, Vol. 37 
