Simulation Analysis Of Dynamic Response Of Culvert-road Transition Section In High Speed Railway

High-speed railway in the world,especially China ushered in a big development period,high-speed train in the process of running to maintain stability,safety,reliability and comfort is very important,high-speed railway construction will inevitably encounter different tracks The transition point of the basic connection,these areas is precisely the high-speed railway lines weak links,due to roadbed strength,stiffness,settlement and other differences will lead to the deformation of the rail deformation,resulting in uneven production.Based on the extensive research on the relevant research results at home and abroad,this paper chooses the transition section of a culvert in Wuhan-Guangzhou high-speed railway as the research object,and uses the finite element software to carry on the simulation analysis,and studies the dynamic response characteristic of the culvert transition section under the train load,The main work of this paper is as follows:(1)The dynamic simulation model is established for the transition section of a culvert in Wuhan-Guangzhou high-speed railway.The difference between the measured value and the simulated value is small and the trend of the depth direction is consistent,Verify the reliability of the model.(2)Using the established simulation model,the two dynamic response parameters of the dynamic stress and dynamic displacement of the transition section are studied.The dynamic response distribution of the transition section of the culvert transition is analyzed at 350 km / h.The vertical dynamic stress decreases rapidly along the bottom of the bed surface,and tends to be gentle at the bottom of the bed.The magnitude of the dynamic stress increases proportionally,and the amplitude of the moving displacement decreases stepwise.Along the direction of the section,the dynamic stress is saddle-shaped distribution,Its maximum value appears at the edge of the loading plate,the maximum displacement of the displacement plate appears in the center of the loading plate,the variation range is less than the vertical dynamic stress.(3)The influence of driving factors(including the driving speed and axle load)and the parameters of the subgrade parameters(including the basement elastic modulus and the bed surface thickness)on the dynamic response of the transition section are analyzed.The results show that the dynamic response The increase of the elastic modulus of the basement bed will increase the dynamic response of the bedsurface,and the increase of the bed surface thickness will be reduced.(4)The distribution and the difference of the dynamic response of the three transition schemes without transition,transition and secondary transition are analyzed.The results show that the setting of the transition section can be reduced due to the difference.The dynamic response of the transition system is smaller than that of the second transition scheme,and the dynamic shift of the second transition scheme is more gentle than that of the transition scheme.