In regions with seasonal frozen soil, mechanical properties of soil are impacted by freeze-thaw cycles, which influence the shear resistance of soil-concrete interface in geotechnical engineering. For evaluating shear properties at the soil-concrete interface, freeze-thaw cycles and direct shear experiments were conducted in this research. The stress-displacement curves, shear strength and parameters of the interface were analyzed in relation to freeze-thaw cycles, while the influences by moisture contents and normal stresses were considered. Results show that the curves related to shear stresses and displacements at the interface are strain-hardening, and shear properties gradually deteriorate with repetitive freezing and thawing. The shear strength is positively related to normal stresses, and it increases by approximately 250% while normal stress varies from 100 to 400 kPa. However, it is negatively correlated with growing moisture contents and freeze-thaw cycles. The reduction in shear strength is about 21%–25% after freeze-thaw cycles, along with a decrease in cohesion ranging from 14% to 20% and for angle of internal friction it reaches at 14%–24%. Moreover, an improved hyperbolic model based on the logistic function and hyperbolic model was established to evaluate shear properties at the interface under freeze-thaw cycles, providing a theory base for engineering construction in seasonally frozen soil regions.

在季节性冻土地区，土体的力学性质受到冻融循环的影响，从而影响岩土工程中土体与混凝土界面的抗剪力。为了评估土-混凝土界面的剪切特性，本研究进行了冻融循环和直剪实验。分析了与冻融循环相关的应力-位移曲线、剪切强度和界面参数，同时考虑了含水量和正应力的影响。结果表明，界面处剪应力和位移的相关曲线呈应变硬化状，剪切性能随着反复冻融而逐渐恶化。剪切强度与法向应力呈正相关，当法向应力在 100 至 400 kPa 之间变化时，剪切强度增加约 250%。然而，它与不断增长的水分含量和冻融循环呈负相关。冻融循环后，剪切强度降低约21%~25%，内聚力降低14%~20%，内摩擦角降低14%~24%。此外，建立了基于Logistic函数和双曲线模型的改进双曲线模型，用于评估冻融循环下界面的剪切特性，为季节性冻土地区的工程建设提供理论基础。