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在京津城际高铁的廊坊段,使用了1000多个数字地震检波器进行连续长时间观测.位于高铁高架桥轨道下方的检波器记录了列车通过时引起的地表振动.数据分析显示,列车经过轨道不同位置处引起的地表振动信号差异较大,而同一位置处不同列车引起的振动则具有很好的相似性,表明影响振动波形的主要因素是高架桥梁及轨道,可以利用长期观测数据来作为轨道及高架结构失稳的预警.对振动信号频率分析的结果表明,列车经过时以及经过后的十几秒时间内存在着能量较强的简谐波振动,可能和轨道及桥梁结构有关.使用轨道下方的采集信号与2~4 km外的另外一条观测测线信号进行互相关处理,可以得到信噪比很高的虚震源记录,表明列车振动信号可以沿地表传播几公里甚至更远.
In Langfang section of Beijing-Tianjin intercity high-speed rail, more than 1000 digital geophones were used for continuous long-term observation.The geophones below the viaduct track of high-speed rail recorded the surface vibration caused by the train passing through.Data analysis showed that the train passed the track The difference of the ground surface vibration signals caused by different locations is quite large while the vibration caused by different trains at the same location has good similarity. It shows that the main factor that affects the vibration waveform is the viaduct and the orbit, and the long-term observation data can be used as the orbit And the warning of instability of elevated structure.The results of frequency analysis of vibration signals show that there exists strong harmonic vibration in the ten and ten seconds after the passing of the train and may be related to the orbit and bridge structure.The orbital The cross-correlation between the acquired signal and another observation line signal outside 2 ~ 4 km can get the signal of the high-SNR virtual vibration source, indicating that the train vibration signal can propagate a few kilometers or even farther along the earth’s surface.