高铁地震信号衰减特征分析及震源函数验证

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摘要高铁震源作用下地震波的特征分析和应用探究是高铁地震学的研究重点。对高铁地震信号衰减特征的分析有助于地下结构的探测和反演，能够反映实际特高铁地震信号突出特征的高铁震源函数，为扩展相关应用领域提供了基础。通过将行驶中的高铁列车简化为移动的多组点源模型，综合考虑地震波衰减的影响因素，合成了高铁震源函数。通过现场监测试验，分别分析了振动速度、瞬时能量谱和边际谱的衰减特征，对比分析了实际高铁地震信号与合成高铁地震信号的衰减特征，结果表明：振动速度和瞬时能量的衰减趋势一致，与震源距离越近，振动速度和瞬时能量的衰减程度越大；距离震源35m和55m处产生了局部振动增大现象；利用合成高铁震源函数反映高铁地震信号能量衰减征是可行的。

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	贾宝新1
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	周志扬1
	苑文雅1

关键词 ：高铁地震学, 高铁震源函数, 点源模型, 衰减特征, 振动增大现象

Abstract：The characteristic analysis and application exploration of seismic waves under the action of high-speed-train source is the research focus of high-speed-train seismology. The analysis of the attenuation characteristics of high-speed-train seismic signals is helpful to the detection and inversion of underground structures, and the high-speed-train source function which can reflect the outstanding characteristics of actual high-speed-train seismic signals provides a basis for expanding related application fields. By simplifying the running high-speed train to a moving multi-group point source model and comprehensively considering the influence factors of seismic wave attenuation, the source function of high-speed-train is synthesized. Through the field monitoring test, the attenuation characteristics of vibration velocity, instantaneous energy spectrum and marginal spectrum are analyzed respectively, and the attenuation characteristics of actual high-speed-train seismic signal and synthetic high-speed-train seismic signal are compared and analyzed. the results show that the attenuation trend of vibration velocity and instantaneous energy is consistent, and the closer the distance to the source is, the greater the attenuation degree of vibration velocity and instantaneous energy is, and the local vibration increases at 35m and 55m from the source. It is feasible to use the synthetic high-speed-train source function to reflect the energy attenuation characteristics of high-speed-train seismic signals.

Key words： high-speed-train seismology source function of high-speed-train point source model attenuation characteristics vibration increase phenomenon

收稿日期: 2021-08-30 出版日期: 2022-12-28

引用本文:

贾宝新1,2，周志扬1，苑文雅1. 高铁地震信号衰减特征分析及震源函数验证[J]. 振动与冲击, 2022, 41(24): 226-223.
JIA Baoxin1,2,ZHOU Zhiyang1,YUAN Wenya1. Analysis on the attenuation characteristics of seismic signal produced by high-speed-train and verification of the source function. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(24): 226-223.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I24/226

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