|Table of Contents|

Train-induced vibration characteristics in throat area of sinking metro depot(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2020年03期
Page:
51-60
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Train-induced vibration characteristics in throat area of sinking metro depot
Author(s):
CHEN Yan-ming1 FENG Qing-song1 LIU Qing-jie1 LIU Wen-wu2 LUO Xin-wei2
(1. Engineering Research Center of Railway Environmental Vibration and Noise of Ministry of Education, East China Jiaotong University, Nanchang 330013, Jiangxi, China; 2. Guangzhou Metro Design and Research Institute Co., Ltd., Guangzhou 510010, Guangdong, China)
Keywords:
railway engineering sinking metro depot vibration source strength vibration propagation law field measurement
PACS:
U231
DOI:
10.19818/j.cnki.1671-1637.2020.03.004
Abstract:
The vibration accelerations of rail, ballast bed, ground, floor and cover plate in the throat area of a sinking metro depot were measured on site by the trigger acquisition method. The field measured data were analyzed by the methods of insertion loss, one-third octave band spectrum and curve fitting of Z direction vibration level. Furthermore, the vibration source characteristics in the throat area of sinking metro depot and the transmission law of vibration along the cover plate and different floors were analyzed. Analysis result shows that in the frequency domain, the frequency band of rail vibration is wider than that of ballast bed, and there is no obvious main frequency band. The vibration distribution of rail is within 800 Hz. While the ballast bed has an obvious main frequency band within 80-200 Hz. The vibration attenuations from the rail to the ballast bed at the first and second floors underground are about 29.9 and 10.4 dB, respectively. The train-induced vibration response of cover plate decreases linearly with the increase of distance between the measuring point and the center line of running track, and the linear attenuation rate is about 0.2 dB·m-1. Due to the reflection and refraction of the side wall to the vibration, the local amplification phenomenon occurs when the vibration is transmitted to the end of cover plate. No matter the train is running at the end of metro depot or in the middle track, with the increase of distance between the measuring point and the center line of running track, the vibration level of cover plate is basically the same at the low frequencies of 2.5 and 5.0 Hz, decreases slowly at 10 Hz, and decreases obviously at the middle and high frequencies of 25, 40 and 80 Hz. The upward propagation of train-induced vibration shows a floor-by-floor attenuation law. The vibration of cover plate caused by the train operation at the first floor underground is about 16.1 dB greater than that at the second floor underground. The characteristics of many rail joints and turnouts in the throat area of sinking metro depot lead to the prominent vibration response of cover plate in this area. It is necessary to focus on the vibration reduction design of this area. 3 tabs, 17 figs, 32 refs.

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Last Update: 2020-07-10