Abstract: The ice cementation effects to the structure surface bond soil particles and infrastructure together during soil freezing. This cementing force is named freezing strength between frozen soil and foundation which is usually measured by means of the shearing strength of the interface. Hence, the strength characteristics as well as the relations between shearing stress and shearing strain of interface are very important to analyze the interaction between structures and the permafrost and to determine the uplift performance of foundation in permafrost regions. For better engineering application, a series of laboratory direct shear tests on the adfreezing interface between frozen soil and concrete plate are performed to investigate the mechanical behavior of the interface. Based on the stress and shear displacement relation of the interface and standard modeling method, a stress-displacement-temperature constitutive equation of the interface is deduced to describe the mechanical behaviors of the adfreezing interface. Experimental results indicate that the constitutive model can reasonably describe the stress-displacement principles for different temperatures. The constitutive relation can also be used in the numerical simulation of stress and deformation of the structures in cold regions.

Key words: frozen soil-concrete interface, direct shear test, constitutive relation