低温饱和岩石未冻水含量与冻胀变形模型研究

doi:10.13722/j.cnki.jrme.2015.1157

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Abstract Seasonal temperature variation induces cyclic frost heaving and shrinkage of rock in cold regions. The unfrozen water content and frost heave in rock under low temperature are the key problems for numerical simulation and stability analysis of engineering in cold regions. Because rock，different from soil，is a brittle porous medium，its unfrozen water content cannot be directly measured experimentally. Considering the existence of unfrozen water films and the freezing point depression of pore water at low temperature，a theoretical expression of unfrozen water content in frozen rock was established with the assumed distribution function of accumulative pore volume，and the expression was validated to be reliable with examples. Assumed rock as the elastic porous medium，the ice pressure was derived on the condition of volume equality. The ice pressure in pores was considered to be equivalent to the triaxial tensile loads on the surface of rock and a frost heave model was thus established based on the elastic theory. The results show that the frost heaving strain in saturated frozen rock is a function of the mechanical parameters of rock matrix，porosity and unfrozen water content. Finally，the frost heave model was validated to be correct and practical by comparison with two existing frost heave experiments.

Key words： rock mechanics frozen rock unfrozen water content effective frost heaving stress frost heave

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	LIU Quansheng1
	2
	HUANG Shibing1
	KANG Yongshui1
	PAN Yucong1

Cite this article:

LIU Quansheng1,2,HUANG Shibing1, et al. Study of unfrozen water content and frost heave model for saturated rock under low temperature[J]. , 2016, 35(10): 2000-2012.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.1157 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/I10/2000

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