Influence of Permafrost Table Downward Shift on the Foundation Pile Force of the Bridge Pile Foundation in Permaforst Regions

In the background of global climate getting warmer and the impact of human factors,the carrying capacity of permafrost engineering foundation changes with the variation of permafrost table.The numerical value of foundation pile is simulated and analysed according to the pile foundation bearing performance of the bridge on Qinghai-Tibet Railway.The influential rule of permafrost table variation on foundation pile force and displacement is obtained by comparing the internal force and displacement of foundation pile under the condition of permafrost table variation,which provides reference for pile foundation design and construction of the permafrost bridge.