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<p>To study the waveform variation law of seismic records for advanced detection using rock-breaking vibration as a seismic source during the operation of a shaft tunneling machine, this article establishes a forward modeling of poor geological bodies based on the finite difference time domain method (FDTD). By applying the improved Hilbert–Huang transform to the collected seismic records, the time–frequency domain characteristics of the waveform are analyzed, and the results are verified using wavelet transformation. The applicability of this method for seismic signal analysis is verified. The main conclusions are as follows: The energy intensity of direct waves is much greater than that of reflected waves, and the main energy of direct waves is concentrated between 0 and 90&#xa0;Hz, while the main energy of reflected waves is concentrated between 0 and 110&#xa0;Hz. The overall energy of caves in poor geological bodies is the largest. </p>

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Forward Simulation of Unfavorable Geological Bodies and Analysis of Waveform Characteristics Based on time Domain Finite Difference Method

  • 期刊论文

  • 发表日期：

    2025年4月29日

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  • You Shuai,
  • Yang Renshu,
  • Yang Liyun,
  • Duan Yun,
  • Liu Xiangyu,
  • Xiao Chenglong,
  • Zhang Xiang,
  • Yang Zhen,
  • Li Chengxiao,
  • Li Dongze

摘要

To study the waveform variation law of seismic records for advanced detection using rock-breaking vibration as a seismic source during the operation of a shaft tunneling machine, this article establishes a forward modeling of poor geological bodies based on the finite difference time domain method (FDTD). By applying the improved Hilbert–Huang transform to the collected seismic records, the time–frequency domain characteristics of the waveform are analyzed, and the results are verified using wavelet transformation. The applicability of this method for seismic signal analysis is verified. The main conclusions are as follows: The energy intensity of direct waves is much greater than that of reflected waves, and the main energy of direct waves is concentrated between 0 and 90 Hz, while the main energy of reflected waves is concentrated between 0 and 110 Hz. The overall energy of caves in poor geological bodies is the largest.