Abstract:  In cold region engineering, the shear performance of frozen soil-structure interface is a key factor influencing the long-term service stability of facilities. However, the existing studies lack systematic characterization of the interface damage mechanism under the action of multi-physical field interactions. In order to reveal the mechanical behavior of frozen soil-structure interface by adjusting the ice-water phase transition process under the disturbance of thermodynamic conditions, this study systematically reviews the research progress of shear properties of frozen soil-structure interface from three aspects such as experimental methods, influencing factors and constitutive models. Firstly, by summarizing the methods of direct shear test, in-situ test and model pile test, the influence pathways of various factors on the mechanical behavior of the interface under the multi-field coupling condition of heat-water-salt-force are clarified. Furthermore, the mechanism of temperature, moisture, freeze-thaw cycle and salt on the interfacial shear performance by regulating the ice-water phase transition process was analyzed. Finally, the applicability and limitations of the existing constitutive model of frozen soil-structure interface are evaluated. The results show that the temperature gradient and water migration change the interfacial shear performance by regulating the ice cementation strength and the thickness of the unfrozen water film during the ice-water phase transition process. The pore reconstruction and ice crystal differentiation caused by freeze-thaw cycles lead to the deterioration of interface strength. Salt affects the interface space composition by changing the phase transition temperature threshold and salt crystallization expansion effect. The existing models have obvious deficiencies in ice-water phase transition, long-term freeze-thaw and multi-field coupling characterization. It is suggested that future work focus on developing a thermo-hyforr-salt-mechanical coupled interface model based on a “test-observation-model” framework integrated  with cross-scale observation technology, thereby providing a design basis and research direction for frost-heave prevention and disaster mitigation in cold regions.

Key words:  , interface system, shear performance, frozen soil, structural interface, ice-water phase transition, freeze-thaw cycle, constitutive model