If the running speed of the vehicle further increases in the future, the ground vibration propagating to the surroundings may increase. In this study, we focused on the floating slab track as a countermeasure against ground vibration and evaluated the dynamic response at 400 km/h by numerical analysis. Moreover, we carried out the vibration test for full-scale track model and confirmed that the floating slab track showed high reduction effect of ground vibration.
When the maximum operating speed of the Shinkansen is further increased, there is a possibility that noise and vibration propagating to the surroundings increase. In this study, we focused on the floating slab track with the anti-vibration components made of urethane as a countermeasure against ground vibration. We carried out the vibration test for full-scale track model and confirmed that the floating slab track showed high reduction effect for ground vibration. Furthermore, the ground was modeled into multiple patterns based on the geological data in a Shinkansen section, and the scope of application of the floating slab track in high-speed rail was examined by vehicle running analysis and ground vibration analysis.
In the slab track laid in a cold area, gaps are generated between the track slab and the filling layer. Currently, the gap is repaired based on the amount of gap measured. In the future, new repair criteria based on a characteristics of load resistant capacity of track slab will be required. Therefore, loading test of slab model specimens and finite element analysis of slab tracks were performed. Based on these results, a repair criteria using displacement of the track slab was proposed.