The railway road and bridge transition section is a vital part of a whole railway line,and it is also a relatively weak part;the frost heave of the railway road and bridge transition section in the alpine seasonal frozen soil area causes the deformation and displacement of the pier girder body,which has a great impact on the smoothness of the line.In order to solve the frost heave problem of railway road and bridge transition section in alpine seasonal frozen soil area,based on the thermodynamic coupling theory,ABAQUS software was used to establish a numerical model of railway road and bridge transition section,analyze the development and variation laws of temperature field and soil fill in the transition section,and explore the bridge-abutment-fill interaction caused by frost heave behind the abutment.The results show that the thermodynamic properties of the material and the temperature boundary of the abutment are the main factors affecting the equilibrium process and distribution law of the temperature field,and the influence is gradually weakened with the increase of distance from the abutment.The soil temperature in the transition section shows sinusoidal distribution,phase lag and amplitude attenuation law.With the development of horizontal frost heave deformation of the fill,the abutment gradually shifts and tilts,which leads to the tightening of the bridge and the abutment,thus affecting the safety of the bridge structure.
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