(1. State Key Laboratory of Frozen Soil Engineering，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou，Gansu 730000，China；2. University of Chinese Academy of Sciences，Beijing 100049，China)
Abstract：Based on the existing and improved test equipments，a unidirectional frost heaving test was carried out in the laboratory in order to explore the regularity of force and deformation in the process of frost heaving under different paths. Considering that the constraint force will cause a compression deformation of the unfrozen soil，therefore，a series of conversion formulas were fitted through a group of compression tests of thawed soil under different loads，and then these formulas were applied to the results analysis of the frost heaving test. During the frost heaving test，the variables including temperature，force and displacement were monitored，the appearance of soil samples were observed in real time，and the water contents by layers were measured after the test. Through the analysis of the relationships among those variables during freezing，it was proved indirectly that the mechanism of constraint force to restrain the frost heaving was to restrain the water migration actually. The relationship between constraint forces and constraint rates affected by the path was not significantly，the coordinate points were enveloped by the upper and lower edge lines and presented a zonal distribution，while the upper edge line was the safest curve. In addition，the variation of forces and deformations under different paths can also be inverted according to the regularity of frost heaving. The results of this experiment can provide a theoretical guidance and proposal for the design of foundation in permafrost regions and for the study of interaction between pipes and frozen soil.
黄 龙1，2，盛 煜1，黄旭斌1，2，何彬彬1，2，张玺彦1，2. 不同路径下土体单向冻胀过程力与变形试验研究[J]. 岩石力学与工程学报, 2019, 38(S2): 3870-3882.
HUANG Long1，2，SHENG Yu1，HUANG Xubin1，2，HE Binbin1，2，ZHANG Xiyan1，2. Experimental study on force and deformation of soil during unidirectional frost heaving under different paths. , 2019, 38(S2): 3870-3882.
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2019, Vol. 38 
