Underwater Acoustic Characteristics of High-Speed Railway Subsea Tunnel

Focusing on the distribution characteristics of marine acoustics caused by high-speed railway channel tunnels, a high-speed railway channel tunnel-ocean bed-ocean fluid-solid coupling dynamic model is established based on the finite element method and fluid-solid coupling theory. By applying the wheel-rail interaction forces which is calculated with the wheel-rail coupling dynamics model as the excitation, the distribution characteristics of the ocean sound pressure has been studied. The spatial propagation law of marine acoustics has been illustrated. Results show that when the train is running at 250km/h, the maximum vibration of the surface of the ocean bed does not appear directly above the tunnel, but on the path that is transmitted upward by 45 degrees on both sides of the tunnel. The maximum underwater sound level is about 136.2 similar to 143.9dB, and the dominant frequency is mainly concentrated in the range below 200Hz. In the vertical direction, the sound level decreases by 3.6 similar to 7.6dB within a depth of 20m. In the horizontal direction, the variation of the sound level at the same sea level is within 2dB ranging from 0 similar to 40m.