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<p>To create new free surfaces and release space for subsequent blastholes in multi-hole blasting, it is essential to thoroughly understand the evolution laws of blasted volume and rock-throwing velocity, thereby providing theoretical guidance for designing delay times and optimizing blasting parameters. Based on the equivalent charge and blasting crater theories, this study established an analytical relationship between the blasted volume and blasting parameters. Considering the mutual influence of adjacent boreholes, optimized calculation equations for rock-throwing velocity and trajectory in the overlapping and non-overlapping regions were developed based on the derived blasted volume formula, energy conservation, and vector superposition. Furthermore, numerical models of single-hole and three-hole bench blasting were established, and the rock movement process was recorded using a high-speed camera during field hole-by-hole and row-by-row detonation blasting tests. The results indicate that when the rock-throwing velocity reaches its first peak, the effect of blasting gases and stress wave on the thrown rock can be neglected, and it is considered that rock throw begins at this point. The theoretical calculation results have an error of less than 10% compared with simulation and field results. Additionally, the evolution laws of rock-throwing velocity in bench blasting are summarized as follows: (1) The rock-throwing velocity initially accelerates and then decreases irregularly after reaching the first peak, which is caused by the massive escape of blasting gases and the secondary fragmentation of rocks. (2) Both the hole-by-hole and row-by-row detonation methods exhibit overlapping effect regions on the bench surface, and an overlapping effect region appears between the tops of the two holes due to the influence of adjacent blast holes in the row-by-row initiation. (3) The highest rock-throwing velocities for hole-by-hole and row-by-row initiations appear in the middle hole and the first detonation hole, respectively.</p>

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Prediction of Blasted Volume and Rock-Throwing Velocity in Bench Blasting

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • Xiaoming Lou,
  • Wei Liang,
  • Xiaofeng Huo,
  • Shuyi Xiao,
  • Yong Wei,
  • Guoding Wang

摘要

To create new free surfaces and release space for subsequent blastholes in multi-hole blasting, it is essential to thoroughly understand the evolution laws of blasted volume and rock-throwing velocity, thereby providing theoretical guidance for designing delay times and optimizing blasting parameters. Based on the equivalent charge and blasting crater theories, this study established an analytical relationship between the blasted volume and blasting parameters. Considering the mutual influence of adjacent boreholes, optimized calculation equations for rock-throwing velocity and trajectory in the overlapping and non-overlapping regions were developed based on the derived blasted volume formula, energy conservation, and vector superposition. Furthermore, numerical models of single-hole and three-hole bench blasting were established, and the rock movement process was recorded using a high-speed camera during field hole-by-hole and row-by-row detonation blasting tests. The results indicate that when the rock-throwing velocity reaches its first peak, the effect of blasting gases and stress wave on the thrown rock can be neglected, and it is considered that rock throw begins at this point. The theoretical calculation results have an error of less than 10% compared with simulation and field results. Additionally, the evolution laws of rock-throwing velocity in bench blasting are summarized as follows: (1) The rock-throwing velocity initially accelerates and then decreases irregularly after reaching the first peak, which is caused by the massive escape of blasting gases and the secondary fragmentation of rocks. (2) Both the hole-by-hole and row-by-row detonation methods exhibit overlapping effect regions on the bench surface, and an overlapping effect region appears between the tops of the two holes due to the influence of adjacent blast holes in the row-by-row initiation. (3) The highest rock-throwing velocities for hole-by-hole and row-by-row initiations appear in the middle hole and the first detonation hole, respectively.