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<p>Since ultra-deep hole loosening blasting uses significantly larger hole diameters and charges than shallow hole blasting, determining the optimal stemming length is crucial. This study investigates the optimal stemming length for ultra-deep hole loosening blasting. Numerical simulations analyze the effectiveness of different blasting methods, showing that single-point forward blasting ensures rock mass loosening while minimizing damage in the plugging section. Based on this, a theoretical calculation method is developed for ultra-deep holes, indicating an optimal stemming length of 2.9–4.35&#xa0;m for a 0.08&#xa0;m diameter hole. The minimum stemming length is 3.04&#xa0;m when using the limit value of stemming strength. Numerical simulations verify these findings, confirming that a 0.08&#xa0;m diameter hole requires at least 3&#xa0;m of stemming. Field tests at a coal mine driving face validate the theoretical and the simulation results, proving their reliability. This research guides selecting appropriate stemming lengths, improving blasting efficiency, and ensuring construction safety.</p>

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Study on Different Initiation Methods and Optimal Stemming Length of Ultra-deep Hole Blasting

  • 期刊论文

  • 发表日期：

    2025年6月9日

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  • Renliang Shan,
  • Junqi Liang,
  • Wenjiao Gao,
  • Qihang Dai,
  • Wei Song,
  • Shengchao Xiao,
  • Yidi Wang

摘要

Since ultra-deep hole loosening blasting uses significantly larger hole diameters and charges than shallow hole blasting, determining the optimal stemming length is crucial. This study investigates the optimal stemming length for ultra-deep hole loosening blasting. Numerical simulations analyze the effectiveness of different blasting methods, showing that single-point forward blasting ensures rock mass loosening while minimizing damage in the plugging section. Based on this, a theoretical calculation method is developed for ultra-deep holes, indicating an optimal stemming length of 2.9–4.35 m for a 0.08 m diameter hole. The minimum stemming length is 3.04 m when using the limit value of stemming strength. Numerical simulations verify these findings, confirming that a 0.08 m diameter hole requires at least 3 m of stemming. Field tests at a coal mine driving face validate the theoretical and the simulation results, proving their reliability. This research guides selecting appropriate stemming lengths, improving blasting efficiency, and ensuring construction safety.