Environmental Vibration Test and Analysis of Viaduct Bridge of 350 km/h High-speed Railway

High-speed trains traveling at high velocities will generate ground vibration pollution,which is one of the main forms of environmental pollution.In order to investigate the environmental vibration level of viaduct bridges of high-speed railway,the environmental vibration is tested and analyzed for No.247 pier of the Yang Cun mega bridge of Beijing-Tianjin Inter-City high-speed railway when the train is traveling through.The result shows that the attenuation regularity of the maximum Z weighted vibration acceleration level VL zmax,the cumulative percent Z weighted vibration acceleration level VL z10,and the equivalent continuous Z weighted vibration acceleration level VL zeq all follow the Logarithmic law with increasing of the distance from the viaduct bridge to the measurement point.There is an obvious attenuation of environmental vibration within 30 m distance from the vibration source,and a smooth attenuation out of 30 m from the vibration source.The value of environmental vibration predicted by the current prediction formula of China's high-speed train is 9.7 % higher than the measured value within 15 m to 60 m distance from the vibration source.