Abstract:The influence of temperature and freezing-thawing cycles on the horizontal bearing mechanism of frozen soil foundation pile has not been clarified, and the calculation method of horizontal bearing force and deformation of foundation pile still needs to be further studied. Based on the existing experimental researches, a p-y curve model of pile foundation considering temperature and freeze-thaw cycles was established, and a finite difference solution for calculating the internal force and displacement of pile under horizontal load was derived. It was found that the p-y curve considering temperature and freeze-thaw cycle could reflect the horizontal bearing characteristics of piles in frozen ground. The lower the freezing temperature, the smaller the horizontal displacement and bending moment of the pile. When the freezing temperature T >-5 ℃, the internal force and displacement of the pile were greatly affected by the freezing temperature. However, when the freezing temperature T ≤-5 ℃, the influence of freezing temperature on the internal force and displacement of piles was very small. When the number of freeze-thaw cycle was less than 7, the horizontal displacement and bending moment of piles increased nonlinearly. After the soil around the pile underwent 7 freeze-thaw cycles, the horizontal displacement and the maximum bending moment of the pile increased by 51.7% and 16.1% respectively. When the number of freeze-thaw cycle was greater than 7, the horizontal displacement and bending moment of piles were not significantly affected by the number of freeze-thaw cycles.