Numerical Analysis on the Temperature and Stress Field for Subgrade with Berms in Seasonal Frozen Region

According to the mechanism and influencing factors of subgrade frost heaving , subgrade with berms structure was proposed based on typical highway to prevent the frost heaving.The solid model of subgrade was established. Numerical calculation model of subgrade was established by applying the finite difference software FLAC 3D, boundary conditions and parameters of numerical model were determined, models of subgrade with berms of different widths were analysed and calculated. The results show that subgrade with berms can effectively reduce the freezing depth of subgrade, and decrease the stress and deformation of subgrade frost heaving, berm that is 3m wide in given simulation conditions has the most significant effects on preventing and controlling frost heaving .