Study On The Action Characteristics Of The Terminal Spine Of CRTS? Slab Track And Subgrade

Ballastless track structure has the advantages of high stability,high smoothness and so on.China's high-speed railway technology through the introduction of absorption and continuous innovation,the formation of China's unique railway system technology.In the bridge transition section,the temperature force on the continuous base is generated by the longitudinal connection of the whole bridge,so the anchor structure behind the platform is installed in the bridge transition section in our country,which can transfer the longitudinal force such as the temperature force to the roadbed well,so that the track structure of the bridge transition section is stable.There are many types of anchor structures behind the platform.In the practice of ballastless track engineering in China,the T-shaped terminal spine and the double-column terminal spine are the most complex.In this paper,the i T-shaped terminal spine is taken as an example to analyze the functional characteristics of the terminal spine and subgrade.This paper mainly does the following work:(1)Literature was consulted to understand the composition of the T-shaped terminal spine anchorage structure of CRTS? slab ballastless track,and the interaction between the components of the terminal spine structure was studied.Considering the action of longitudinal force and vertical force,the paper analyzes the action characteristics of terminal spine and subgrade.ABAQUS software was used to establish the terminal spine and subgrade solid model,and the simulation results were compared with the previous research results,which verified the rationality of the model.(2)The over-limit settlement deformation of subgrade is simplified into three types: cosine type transfinite settlement,angular type transfinite settlement and transfinite settlement deformation of staggered platform type.ABAQUS software was used to establish the solid model of terminal spine and subgrade under three different working conditions.Under the combined action of longitudinal force and vertical force,the vertical displacement,vertical stress and soil pressure on the side of roadbed of end stab and friction plate were analyzed and studied respectively.The results show that the vertical displacement and vertical stress of the terminal spine and the friction plate are increased and the failure trend of the terminal spine is obvious.(3)Based on the comparison and analysis of the existing grouting technology,the grouting methods and grouting materials suitable for each project are put forward,and the grouting technology schemes under different settlement conditions are put forward according to the existing grouting technology and the settlement characteristics of different working conditions,and the grouting repair under different settlement and deformation conditions is carried out.Contrast repair under normal circumstances,the sedimentation conditions before and after repair three states,analysis the terminal spine and the friction plate of longitudinal vertical,longitudinal and vertical stress and displacement of subgrade lateral earth pressure,know the indicators is decreased a lot before repair,after repair and under normal circumstances are basically the same,the other a index is better than that of normal,achieve good repair effect.