Experimental Study of Environmental Vibration and Noise Caused by High-speed Railway

摘要

Operation of Beijing-Tianjin inter-city railway indicates the " high-speed era" being coming in China.However,as the increase of the train speed,the environmental vibration and noise problem along the railways has been increasingly severe.Therefore,investigation and studying the influence of environmental vibration and noise will be available for mitigating the environmental pollution problem.In this paper,the environmental vibration and noise levels under different working conditions are obtained based on the field testing along a certain high speed railway,and the propagation and attenuation characteristic of environmental vibration and noise in the both side of high speed railway were studied under different conditions.It is verified that:① When the vehicle speed is over 300kph,the environmental vibration level away from centerline 30m will reach to 73dB,and the impact of the environmental vibration decrease with increasing distance from the railway center line,the natural attenuation quantity of environmental vibration is about 2-3dB every 10m.② The main frequency of vibration energy is about 8-80 Hz,and the rate of attenuating speed of high frequency vibration is higher than that of low frequency vibration,therefore,the vibration amplitude is mainly distributed in the low frequency range in the area far away from the vibration source.③ The environmental noise level away from centerline 30m will reach to 93dB when the vehicle speed is over 400kph,and the main frequency of noise caused by high speed train is about 400-2500Hz.