高速列车诱发桥隧段线路振动特性试验研究

以广深港(广州—深圳—香港)高速铁路光明城高架段以及武广(武汉—广州)高速铁路金沙洲隧道段为工程背景,开展高速铁路振源及环境振动现场测试,研究其振源特点和环境振动衰减规律。试验结果表明:高速列车诱发高架曲线段振源振动强度明显高于直线段,桥面Z振级远高于隧道壁Z振级;高架段断面环境振动Z振级高于隧道段断面最大达33 dB;环境振动Z振级随距轨道中心线距离增加而逐渐减小,但距离15 m以后,高架段和隧道段衰减规律略有不同;环境振动主频集中在20～80 Hz,随着距轨道中心线距离增加,环境振动高频成分衰减速度大于低频成分;对于隧道而言,其埋深越大,环境振动主频越低。研究成果对高速铁路、市域快速轨道交通设计具有参考价值。

Experimental Study on Vibration Characteristics of Bridge and Tunnel Section Induced by High Speed Train Travelling

Taking Guangming elevated bridge of Guangzhou-Shenzhen-Hongkong high speed railway and Jinshazhou tunnel of Wuhan-G uangzhou high speed railway as engineering background,this paper carried out a field testing of vibration source and environment vibration,and studied the characteristics of the vibration source and the attenuation lawof the environment vibration.The results showthat the vibration intensity of the vibration source in curve section of the elevated bridge is obviously higher than that of straight line section,and the Zlevel of bridge deck is much higher than that of tunnel wall.The Zlevel of environment vibration of elevated bridge section is higher than that of tunnel section up to 33 dB. The Zlevel of environment vibration gradually decreases with increasing distance from the center of the track,but the attenuation laws of elevated bridge section and tunnel section are slightly different when the distance is larger than 15 m.The main frequency of environment vibration is concentrated in 20 ~80 Hz.As the distance from the center of the track increases,the attenuation speed of the high frequency component of the environment vibration is greater than that of the lowfrequency component. The deeper the buried depth of tunnel is,the lower the main frequency of environment vibration is.The research results can provide guidance for the design of high speed railway and urban rapid rail transit.