| As the development of social and economic and the raise of science and technology, types of rail transportation on viaduct are developing rapidly, but the environmental pollution problems induced by vibration also have drawn people's attentions. Aimed at floating slab track, vibration isolation track and ballast track on viaduct, the analysis of paper focus on the vibration situations of viaduct and surrounding ground and the transfer characteristics of the vibration while the train passing though, then draw a comparison of the three types of track. it could provide a theoretical reference not only for the feasible research and the estimation of environmental influence, but also a theoretical basis for the selection of types of track for urban rail transit.By establishing floating slab track-viaduct, vibration isolation track-viaduct, ballast track-viaduct 3D models, make modal analysis in order to compare the natural vibration characteristics of the three different types of track systems.By establishing floating slab track-viaduct,vibration isolation track-viaduct,ballast track-viaduct 2D models, under the conditions of the sixth and fourth grade of track vertical profile irregularity, modeling the dynamic response of the viaduct while the moving loads passing through the viaduct at different velocities, we can get the vibration characteristics of viaduct and the reaction forces of the piers, and also make the spectrum analysis.By establishing pier-soil 2D finite dynamic element model, act an unit impulse load on the model to analyze the spreading vibration properties of soil and verify the correctness of the model. Acting the reaction force of piers get from floating slab track-viaduct, vibration isolation track-viaduct and ballast track-viaduct on the different characteristics of soil to analyze and draw the comparisons of the spreading properties of vibration caused by different types of track structures. |
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