The G214 expressway is the first major expressway constructed in permafrost regions on the Qinghai-Tibet Plateau. This paper investigates the temperature field distribution and deformation of subgrade by establishing the finite element model. The temperature boundary, vehicle load and the global warming condition of roadbed are considered as influencing factors. The numerical results indicate that subgrade generates large settlement in first year after construction and would reach a stable state in five years. Vertical displacement in embankment internal is related to the variation of melt soil cores. It means that the freeze-thaw cycle makes a big contribution to vertical displacement.

来源平台：CONSTRUCTION AND MAINTENANCE OF RAILWAY INFRASTRUCTURE IN COMPLEX ENVIRONMENT