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<p>In open-pit bench blasting, the physical properties of the coupling medium determine the energy on the borehole wall and the evolution of the source spectrum. To investigate the effects of different coupling medium on the vibration frequency and energy distribution in open-pit bench blasting, theoretical analyses and comparative tests were conducted on decoupled blasting with air and water medium. To address the noise problem of strong nonlinear blasting signals in complex environments, the CEEMDAN was used to decompose the signals into several intrinsic mode functions (IMFs), and the Hilbert transform was utilized to analyze the evolution of their instantaneous frequencies and energy. Research results show that, compared to air medium, vibration signals generated by water-medium decoupled blasting exhibit a significantly higher energy proportion in the low-frequency band (2–10 Hz), with the IMF4 component becoming the key factor dominating the energy distribution. The analysis indicates that differences in the physical properties of the medium alter the pressure and energy at the borehole wall, causing the water-medium decoupled blasting signals to display low-frequency characteristics. These findings provide a reference for controlling blasting resonance hazards and optimizing charging structures.</p>

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Study on blasting vibration characteristics in open-pit bench with different coupling medium

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Jie Shan,
  • Meng Wei,
  • Hong-lu Fei,
  • Yu Yan,
  • Shi-jie Bao,
  • Qing-yun Qian

摘要

In open-pit bench blasting, the physical properties of the coupling medium determine the energy on the borehole wall and the evolution of the source spectrum. To investigate the effects of different coupling medium on the vibration frequency and energy distribution in open-pit bench blasting, theoretical analyses and comparative tests were conducted on decoupled blasting with air and water medium. To address the noise problem of strong nonlinear blasting signals in complex environments, the CEEMDAN was used to decompose the signals into several intrinsic mode functions (IMFs), and the Hilbert transform was utilized to analyze the evolution of their instantaneous frequencies and energy. Research results show that, compared to air medium, vibration signals generated by water-medium decoupled blasting exhibit a significantly higher energy proportion in the low-frequency band (2–10 Hz), with the IMF4 component becoming the key factor dominating the energy distribution. The analysis indicates that differences in the physical properties of the medium alter the pressure and energy at the borehole wall, causing the water-medium decoupled blasting signals to display low-frequency characteristics. These findings provide a reference for controlling blasting resonance hazards and optimizing charging structures.