摘要
针对某城际快铁高架桥列车运行引起的附近自由场地环境振动进行现场测试。结果表明，在近场测点，加速度时程呈明显列车周期性加载现象；随距离的增加，振动快速衰减，并在7.5 m处有反弹增大现象；距线路越远，振动衰减越慢，地面振动加速度级随距离的变化满足对数关系；高架轨道交通引起的地面横向水平振动加速度级较竖向大3.9～9.0 dB；地面竖向振动优势频率范围10~100 Hz，横向振动频率主要在4～100 Hz，低频振动较高频振动传播距离更远；双线高架桥引起的环境振动偏载效应突出；振动加速度级随车速的变化规律为0.036～0.049 dBkm/h。
Abstract
On the basis of the measuring ground-borne vibration of some inter-city express railway viaduct, test results analysis shows that: a cyclical peak of acceleration can be clearly distinguished in the near field; whether transverse or vertical vibration, a rapid attenuation of vibration with the distance to the near-track center is observed, however the vibration at 7.5 m appears to be amplified; farther from the track center, the ground vibration decreases more slowly, and the ground vibration with the distance conforms to a logarithmic relationship; the horizontal ground vibration caused by the elevated rail transit is larger 3.9～9.0 dB than the vertical vibration ; the dominant frequency of the vertical ground vibration is 10~100 Hz, while the transverse vibration has a wider frequency range of 4~100 Hz; low-frequency vibration transfers farther than high frequency vibration; the partially effect of environmental vibration induced by two-track viaduct is obvious; vibration level increases with the speed in the slope of 0.036 ~ 0.049 dB/(km/h).
关键词
轨道交通 /
高架桥 /
环境振动 /
现场测试 /
振动加速度级
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Key words
rail transit /
viaduct /
environmental vibration /
field measurement /
vibration acceleration level
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李小珍;刘全民;张 迅;张志俊;李亚东.
高架轨道交通附近自由地表振动试验研究[J]. 振动与冲击, 2014, 33(16): 56-61
LI Xiao-zhen;LIU Quan-min;ZHANG Xun;ZHANG Zhi-jun;LI Ya-dong.
Investigation of ground vibration induced by inter-city express train[J]. Journal of Vibration and Shock, 2014, 33(16): 56-61
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