为了解我国东部沿海地区高架桥段高铁与地铁列车共同通过时地面振动特性的变化，在常州北站附近京沪高架桥与常州地铁1号线交汇处布置测点，实测高架桥段单向、双向列车通过和高铁与地铁列车相继通过产生的地面振动响应，并对比分析了不同通过工况下的地面时频振动特性。研究结果表明：进出站列车相向运行会引起地面振动持时变长、振幅变大，沿轨道方向振动放大现象更明显，且振动放大现象主要发生在主频附近，个别频段存在振动减小现象；地铁和高铁相继通过时，在距离轨道中心线的5.5 m范围地面振动主要由高铁作用引起，而在5.5 m范围外呈现地铁高铁共同作用引起振动放大的现象，较高铁单独作用时振级增量达18.2 dB。测试结果可为多振源共同作用引起的环境振动研究及数值验证提供参考。
Abstract
In order to study the ground vibration characteristics under the combined action of subway train load and the high-speed train passing through viaduct in the eastern coastal area of China, in-situ measurement is conducted at a testing site adjacent to Changzhou North Railway Station, which is located at the intersection of Beijing-Shanghai high-speed railway viaduct and Changzhou subway line 1. Ground vibration responses were measured under the following three train passing conditions, i.e., the unidirectional train passing through the viaduct, the bidirectional train passing simultaneously through the viaduct, and the subway train operating successively with the high-speed train. The time and frequency characteristics of the tested data are analyzed in detail. The results show that, ground vibration would be amplified when two trains passing simultaneously through the station in opposite directions with one leaving and another arriving; and the vibration amplification effect is more obvious along the track direction. Besides, the vibration amplification phenomenon caused by the joint action of the two trains mainly occurs in the vicinity of the dominant frequencies, and there existed the vibration reduction phenomenon in the other frequency bands. In addition, when the subway train and high-speed train successively passes through the station, ground vibration within 6 m from the track centerline is mainly induced by the high-speed train, with the effect from the subway train can be neglected; while that beyond this range shows a vibration amplification effect with the combined action of subway train and high-speed train. The vibration level could be exaggerated by 18.2 dB compared with the solely operation of high-speed train. Results of this in-situ measurement can provide a reference and validation for the study of environmental vibration caused by the combined action of multiple vibration sources.
关键词
环境振动 /
现场实测 /
双线列车 /
常州地铁 /
多源振动
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Key words
environmental vibration /
field measurements /
double-line train /
Changzhou subway /
multisource vibration
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