350km/h高速铁路高架桥环境振动的测试分析

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

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,VLzmax、VLz10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%。

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 Curl 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 ~, the cumulative percent Z weighted vibration acceleration level VL z10, and the equivalent continuous Zweighted vibration acceleration level VL zaq 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.