Analysis on the attenuation characteristics of seismic signal produced by high-speed-train and verification of the source function

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (24) : 226-223.

JIA Baoxin1,2,ZHOU Zhiyang1,YUAN Wenya1

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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

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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[J]. Journal of Vibration and Shock, 2022, 41(24): 226-223

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