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<p>Vibration wave superposition in delayed blasting is vital for precise vibration control during bench blasting. However, two significant issues remain unresolved, being (1) the lack of accuracy in constructing various single-shot blast vibration curves for hundreds of holes; (2) the considerable discrepancy between the predicted and measured vibration velocities owing to changes in the free-surface conditions caused by the influence of the muck piles generated from the blasting of the front-row holes. In this study, bench blasting at the Barun Mine was used as the research background. The first objective was to reconstruct the single-shot vibration curves for all holes based on the relationship between the measured vibration velocities and technical-operational factors including charge, distance, and site conditions. The range of the blast muck pile was then calculated associating ballistic theory with three-dimensional digital image correlation (3D DIC) technology. On-site measurements of the single-hole blasting damage range were conducted. Then, according to the principle of accumulation continuity, the throw distance of the rear-hole blasting was determined. This result allowed the identification of the critical positions for changes in the free surfaces based on the throw distances. Distinct vibration curves for individual blast holes were constructed based on these positions. Finally, an innovative superposition method was developed for delay-blasting vibrations that accounted for variations in free surfaces. Field applications at the Barun Mine demonstrated that when the row number of blast holes exceeded six, the muck piles generated from the previously blasted holes significantly altered the free-surface conditions. The superimposed vibration curve for 338 blast holes aligned with the measured curve, with a peak vibration velocity error of only 9.31%. This close alignment showed the method to be applicable for precise prediction and control of vibrations in bench-blasting operations, directly stemming from the accurate superimposition results.</p>

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Vibration Control in Multi-Hole Delay Bench Blasting Considering Variations in Blast-Hole Positions and Free Surfaces

  • 期刊论文

  • 发表日期：

    2025年6月9日

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  • Sijie Wang,
  • Min Gong,
  • Haojun Wu,
  • Xiaodong Wu,
  • Xiaodong Xu

摘要

Vibration wave superposition in delayed blasting is vital for precise vibration control during bench blasting. However, two significant issues remain unresolved, being (1) the lack of accuracy in constructing various single-shot blast vibration curves for hundreds of holes; (2) the considerable discrepancy between the predicted and measured vibration velocities owing to changes in the free-surface conditions caused by the influence of the muck piles generated from the blasting of the front-row holes. In this study, bench blasting at the Barun Mine was used as the research background. The first objective was to reconstruct the single-shot vibration curves for all holes based on the relationship between the measured vibration velocities and technical-operational factors including charge, distance, and site conditions. The range of the blast muck pile was then calculated associating ballistic theory with three-dimensional digital image correlation (3D DIC) technology. On-site measurements of the single-hole blasting damage range were conducted. Then, according to the principle of accumulation continuity, the throw distance of the rear-hole blasting was determined. This result allowed the identification of the critical positions for changes in the free surfaces based on the throw distances. Distinct vibration curves for individual blast holes were constructed based on these positions. Finally, an innovative superposition method was developed for delay-blasting vibrations that accounted for variations in free surfaces. Field applications at the Barun Mine demonstrated that when the row number of blast holes exceeded six, the muck piles generated from the previously blasted holes significantly altered the free-surface conditions. The superimposed vibration curve for 338 blast holes aligned with the measured curve, with a peak vibration velocity error of only 9.31%. This close alignment showed the method to be applicable for precise prediction and control of vibrations in bench-blasting operations, directly stemming from the accurate superimposition results.