北京大学学报自然科学版 ›› 2022, Vol. 58 ›› Issue (5): 820-828.DOI: 10.13209/j.0479-8023.2022.047

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基于合成数据对高铁震源虚拟道集生成方法的验证

殷常阳1, 石永祥1, 伍晗1, 宁杰远1,2,†    

  1. 1. 北京大学地球与空间科学学院, 北京 100871 2. 河北红山地球物理国家野外科学观测研究站, 邢台 054000
  • 收稿日期:2021-06-01 修回日期:2022-05-22 出版日期:2022-09-20 发布日期:2022-09-20
  • 通讯作者: 宁杰远, E-mail: njy(at)pku.edu.cn
  • 基金资助:
    河北省地震科技星火计划(DZ20200827054)和国家自然科学基金(41874071)资助 

Validation of the Virtual Gather Generation Method from Synthetic Data for High-Speed Rail Seismic Source

YIN Changyang1, SHI Yongxiang1, WU Han1, NING Jieyuan1,2,†   

  1. 1. School of Earth and Space Sciences, Peking University, Beijing 100871 2. Hebei Hongshan National Geophysical Observation and Research Station, Xingtai 054000
  • Received:2021-06-01 Revised:2022-05-22 Online:2022-09-20 Published:2022-09-20
  • Contact: NING Jieyuan, E-mail: njy(at)pku.edu.cn

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摘要：

根据稳相点分析的叠加方法原理, 提出一种波形叠加方法, 消除台站记录中高铁波场的串扰噪声, 生成虚拟道集, 并用合成的高铁数据进行验证。通过建立高铁桥梁振动方程, 获得精细的高铁震源时间函数, 然后使用有限元方法,在分层介质模型中进行高速铁路波场正演模拟计算, 并对不同速度的高铁列车正演模拟记录进行时移叠加, 获得虚拟道集, 从而验证叠加方法的正确性。

关键词:  高铁, 干涉场, 震源时间函数, 虚拟道集

Abstract:

Based on the principle of superposition method which can eliminate the crosstalk noise of the high-speed rail seismic wavefield recorded by the stations and generate virtual gathers, the operation ways of the superposition method are given and the method is verified on the synthetic high-speed rail data. The precise source time function of the high-speed rail is obtained by establishing the vibration equation of the high-speed rail viaduct, and the forward modeling of the high-speed rail wavefield in layered medium is calculated by using the finite element method and time-shift superposition of forward modeling of the high-speed rail wavefield with different speeds is carried out. The virtual gathers are obtained, which verifies the correctness of the stacking method.

Key words: high-speed rail, interference field, source time function, virtual gather

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