Research On Structure Parameters And Rail Deformation Limit Of Rubber Floating Slab Track On Railway Underground Transit Line

ABSTRACT:In order to facilitate passenger travel and transfer, railway must be inserted into or through city and adjacent to the densely populated areas. Therefore, the vibration and noise of railway cause more and more people’s attention. As the best damping effect track, floating slab track(FST) has a good carrying capacity, ride comfort and stability, and has been applied in urban rail transit for many years. So it can be applied to underground transit line which passing through the vibration sensitive areas. But FST still has not been applied in mainline railway in China as yet. And railway condition is different from urban rail transport, related technical standards cannot be directly used. The reasonable structure type and the rail deformation limit of FST on railway operating conditions are very important for the successful application of FST on railway. It is particularly necessary to investigate the structure selection and deformation limit of rubber FST on railway.Based on FEM, a railway rubber FST analysis model is established by using finite element analysis software ABAQUS. The vibration characteristics of rubber FST under different conditions are researched in details with modal analysis and harmonic response analysis method. And a CRH5vehicle-rubber FST coupled dynamic model is established, the reasonable structure and stiffness of rubber FST are proposed through dynamic analysis of FST system with the considering of driving safety and comfort. In addition, based on the static deformation analysis of FST, reasonable rail deformation limit of rubber FST is investigated by calculating SS9driving safety and comfort indicators under different limit deformation, considering the straight line segments and the600m curve segment respectively.The result shows that:FST can effectively decrease the vibration passing to the sub-structure. Slab thickness, rubber pad stiffness, support mode and laying area of rubber mat are important factors affecting vibration characteristics. The slab thickness is greater and the overall stiffness of rubber is smaller, the damping effect is better. The stability of track with entire-surface bearing is best. When track is unit slab, the location-restricted scheme is necessary. The longitudinal limit capacity of raised blocks is better than embedded plate. Rail vertical displacement is control target of FST structure deformation. When rail vertical deformation limit is4mm, train operation safety and stability meet the specification requirement under the100km/h speed.