吕鹏, 宗刚, 李文涛, 单涛涛. 地铁引发场地振动的实测信号能量分析[J]. 工程力学, 2013, 30(增刊): 325-328. DOI: 10.6052/j.issn.1000-4750.2012.04.S096
引用本文: 吕鹏, 宗刚, 李文涛, 单涛涛. 地铁引发场地振动的实测信号能量分析[J]. 工程力学, 2013, 30(增刊): 325-328. DOI: 10.6052/j.issn.1000-4750.2012.04.S096
L?Peng, ZONG Gang, LI Wen-tao, SHAN Tao-tao. ENERGY ANALYSIS OF GROUND VIBRATION INDUCED BY SUBWAY TRAINS[J]. Engineering Mechanics, 2013, 30(增刊): 325-328. DOI: 10.6052/j.issn.1000-4750.2012.04.S096
Citation: L?Peng, ZONG Gang, LI Wen-tao, SHAN Tao-tao. ENERGY ANALYSIS OF GROUND VIBRATION INDUCED BY SUBWAY TRAINS[J]. Engineering Mechanics, 2013, 30(增刊): 325-328. DOI: 10.6052/j.issn.1000-4750.2012.04.S096

地铁引发场地振动的实测信号能量分析

ENERGY ANALYSIS OF GROUND VIBRATION INDUCED BY SUBWAY TRAINS

  • 摘要: 选取上海某实际场地,开展地铁运行引发的场地振动实测。基于实测加速度响应信号,首先采用传统方法获得了信号在时域和频域内的能量分布特点,总结出场地振动水平随与振源距离增加而衰减的规律及振动频率的主要分布范围。其次,采用Mexican hat小波对信号进行连续小波变换,分析了信号时-频能量谱及时-频累积能量的分布特点,揭示出地铁自身的编组形式是造成振动非平稳性的直接原因,且地铁行进过程中列车对场地多数测点振动响应的影响范围主要集中于穿越测试断面的本节车厢及前方一节车厢,但在振动能量放大区,列车的影响范围基本仅限于穿越测试断面的本节车厢。

     

    Abstract: In-situ vibration measuring was carried out for the ground-borne vibration induced by subway trains in Shanghai. Based on the acceleration recordings, firstly, the characteristics of energy distribution in time domain and frequency domain are obtained respectively by the traditional methods. Accordingly, the attenuation curve is analyzed and the dominant frequency range is obtained. Secondly, the time-frequency energy spectrum and accumulated energy curve are presented by continuous wavelet transform based on Mexican hat wavelet. The train formation is the direct reason to the non-stationary ground vibration. To most of the measuring sites, the scope of the impact of the trains on the vibration is limited mainly by the length of two cars. But in the enlarged area of vibrational energy, the scope of the impact of the trains is limited basically by the length of the car passing by.

     

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