Abstract:Combined with the field loading test of large diameter uplift pile casted in-situ in permafrost region of Qinghai—Tibet Railway,based on actually measured ground temperature in permafrost region,physico- mechanical parameters and frozen soil type,nonlinear finite element analysis is conducted to analyze uplift pile casted in-situ in permafrost region considering creep characteristic. Three-dimensional 10-node tetrahedral structural element is adopted in pile-soil system. Surface-to-surface contact element is used in pile-soil interaction,and the constitutive model of pile-soil system is assumed to obey Drucker-Prager yield criterion. Through the comparison of numerical results and test ones,it is shown that the analytic result and test result of creep deformation agree well with each other. If not considering frozen soil creep in calculation,the difference is not too much when external load is small;and the calculation value of displacement at the top of pile uplift is about 43% smaller than the test result when external load is large. So the method in which frozen soil creep is considered can truly reflect the actual characteristic of uplift pile in permafrost region.