350 km/h 高速铁路高架桥环境振动的测试分析

为了考察350 km/h高速列车运行状态下高架桥的环境振动水平，对京津城际铁路杨村特大桥247号桥墩高速列车运行时的环境振动进行测试，分析了高架桥环境振动的衰减特性。结果表明，VL zmax、VL z10和VLzeq随距离的变化均符合对数衰减规律，距离振源30 m内环境振动衰减明显，距离振源30 m以后衰减逐渐平缓。在距离振源15 m~60 m范围，我国现行的高速铁路环境振动预测公式的预测值最大偏高9.7 %。

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

High-speed trains traveling at high velocities generate ground vibration pollution, which is one main forms of the environmental pollutions. In order to investigate the environmental vibration level of viaduct bridge of high-speed train at 350 km/h in operation, the environmental vibration is tested and analyzed on NO.247 pier of the YangCun mega bridge of Beijing-Tianjin Inter-City high-speed railway. The result shows that the attenuation regularity of the maximum Z weighted vibration acceleration level VLzmax, cumulative percent Z weighted vibration acceleration level VLz10, and the equivalent continuous Z weighted vibration acceleration level VLzeq all follow the Logarithmic law with increase in distance from the viaduct bridge. There is obvious attenuation of environmental vibration in 30 m and smooth attenuation out of 30 m from the vibration source. The value of environmental vibration predicted by the current prediction formula of China high-speed train is up to 9.7% than the measured value within 15m to 60m distance from the vibration source.