Study on Re-Radiated Noise in Futian Underground Hub of Guangzhou-Shenzhen-Hongkong High-Speed Rail

A finite element model considering the high-speed train excitation loads, track structure, vibration reduction measures, station construction, characteristics of foundation soils was established to study the problems of vibration and re-radiated noise in the underground Futian hub of Guangzhou-Shenzhen-Hongkong high-speed rail under the excitation of trains. The first 200 natural frequencies of the station are all within 40Hz, the vibration energy concentrates mainly in the second and third floors, in form of bending vibration mode; the modes of orbital plate mainly accounts for vertical vibration, and the lowest frequency is near 26Hz.When the train passes by at a speed of 200km/h, without damping rubber pads, the maximum vibration level is 57.9 dB, while with damping pads the vibration level decreases by 5~6dB. The re-radiated noise level at the surface of the structure is between 38~55.1dB;with damping measures at the orbits, the corresponding acoustic gain in upper floors is 6dB or so; some low-frequency noise excess the standard, but considering the acoustic measures in upper floors, it should be manageable. It is suggested that the train pass by at lower speed, to further reduce the re-radiated noise, to a create amore comfortable environment.