Abstract:
In order to study the changes in the vibration response of the train to the floating slab, the base, the tunnel wall, the ground and the superstructure when the floating slab track structure is used in the tunnel.The coupling vibration model of vehicle-steel spring floating plate track-soil-building was established, and the vibration acceleration characteristics and vibration level characteristics of the floating plate, tunnel wall, ground and building caused by the vehicle running under different track structures and different vehicle speeds were calculated and analyzed.When the steel spring floating plate track structure is adopted, the maximum Z vibration level of the ground and floor directly above the tunnel caused by the vehicle is less than 70 dB,which can meet the EIA standard.When the buried depth of the tunnel is greater than 11 meters, the vibration level directly above the ground and the floor does not exceed 70 dB,which meets the requirements of the EIA residents and the cultural and educational district.Comparing the floor vibration acceleration Z level of the integral track bed and the steel spring floating plate track structure, it can be seen that the vibration damping effect of the steel spring floating plate structure is better than that of the overall track bed.The research method proposed in this paper can provide an important reference for the future design of vibration and noise reduction tracks of other rail transit lines and even the vibration and noise reduction of sensitive points along rail transit lines in other cities.