Behavior and Control of the Ballastless Track-Subgrade Vibration Induced by High-Speed Trains Moving on the Subgrade Bed with Mud Pumping

Figure 11

The distributions of the vertical vibration acceleration of the ballastless track-subgrade with and without mud pumping. NC, the subgrade bed under the normal condition (or without mud pumping); MP, the subgrade bed with mud pumping; TS, test position on the track slab; CB, test position on the concrete base; SS, test position on the subgrade surface.