沪宁高铁与邻近既有线振动相互影响的测试与分析

为分析列车通过我国第一条修建在软土路基上的沪宁高铁时,引发的振动特性,以及与邻近的京沪铁路既有线路基段的相互影响,在沪宁线新孟河段进行了现场振动测试.对获得的振动加速度信号进行处理得到速度时程曲线,从加速度时程、加速度级、速度峰值PPV和1/3倍频程4个方面,分析了高铁线和既有线的振动特性及振动对邻近线的影响.结果表明：沪宁高速铁路高架桥并行京沪铁路既有线路基段列车运行引发的振动,以竖向振动为主;既有线不同机车型号和客货类型对其本身钢轨及轨枕的加速度振级影响很大,但是远处测点的加速度振级值趋向一致;扣件系统和桥墩支座是衰减振动的关键环节.对比现有的国内外规范标准发现,沪宁高铁和京沪铁路既有线路基段列车运行引发的振动对邻近线的结构不会产生明显影响;沪宁高铁过车引发的振动主要集中在31.5 Hz和63 Hz频段,京沪铁路既有线路基段,过车时振动主频随着不同机车类型存在差异.

Test and analysis for vibration influence between Hu-Ning high-speed railway and adjacent existing line

A vibration test in Xinmeng river section has been conducted to analyze the vibration charac- teristics of Hu-Ning high-speed railway and its effect on the adjacent existing railway. The transmis- sion characteristics of vibrations between the two lines are analyzed from vibration acceleration time history, peak acceleration, peak velocity and 1/3 octave spectrum of acceleration. When the train runs through the subgrade of existing railway or viaduct of Hu-Ning high-speed railway, the vertical vibra- tion is much bigger than lateral vibration. While trains with different locomotive types run through the existing line, the vibration in subgrade stucture will be different, but nearly the same in the long dis- tance. Fastener system and bearing are the key factors for vibration attenuation. According to the rela- tive standards of China and abroad, the vibration produced by the high-speed railway almost has no ef- fects on the structures of adjacent existing railway, and the dominant frequency of Hu-Ning high-speed railway is in the band of 31.5 Hz and 63 Hz, but the vibration dominant frequency of the existing lines will be different according to locomotive types.