Research On Temperature Field And Settlement Of Subgrade In Transition Section Of Highway Bridge In Seasonal Frozen Region

With the continuous construction and operation of high-speed railway in seasonal frozen soil area,people gradually pay attention to the safety and smooth operation of high-speed railway in seasonal frozen soil area.The road-bridge transition section is the substructure of high-speed railway line and plays an important role in connecting bridge and roadbed.This paper takes the transition section of road and bridge as the research object,studies the variation rule of settlement of transition section of road and bridge under the joint action of train load and temperature,and provides reference for the construction and safe operation of high-speed railway in seasonal freezing region.In this paper,based on tunnel engineering and disaster prevention and control technology innovation center in liaoning province cultivation fund project,The bridge transition section of harbin-Dalian high-speed Railway in seasonal frozen soil area is taken as the research object,in fully drawing on and assimilating,on the basis of predecessors’ research results,with theoretical analysis,empirical methods,the method of numerical simulation and analysis of season frozen area bridge transition section of temperature field under the influence of local temperature change rule,The settlement law of bridge transition under frost heaving and thawing settlement and train load is studied,and different forms of bridge transition are compared and analyzed.The main research contents of this paper are as follows:(1)Based on the engineering geological environment of high-speed railway in the seasonal frozen region,the common problems of the transitional section of road and bridge in the seasonal frozen region are summarized,the influencing factors of the deformation of the transitional section of road and bridge in the seasonal frozen region are analyzed,the improvement measures of the transitional section of road and bridge in the seasonal frozen region are discussed and their applicability is analyzed.(2)Finite element analysis software ABAQUS was used to establish a threedimensional numerical model of the subgrade and abutment of the bridge transition,and the transverse and longitudinal variation rules and long-term stability of the temperature field of the bridge transition under the influence of local temperature were analyzed.(3)Based on the above temperature field calculation results,a rail-bridge transition segment model was established by using finite element software to calculate the settlement variation rule of the rail-bridge transition segment under the coupling effect of temperature and train load.The settlement variation law of bridge transition section under train load and frost heave and thaw settlement is compared and analyzed.