Scholarlink

<p>Rational planning of easer hole layout is of significant importance for improving blasting performance. This study proposes a novel design methodology for easer hole positioning by introducing the concept of Area Increment Ratio per Row (AIRR), which regulates the progressive variation in rock fragmentation area across successive rows to determine the collar and toe positions of each easer hole. The methodology comprises three key components: (1) calculation of easer hole row numbers, (2) allocation of rock-breaking area per row, and (3) geometric positioning of easer holes. Through numerical simulations calibrated with field blasting conditions, the optimal AIRR was identified as 0.1. Under this ratio, the proposed layout achieved 53.2% effective damage rate at the end of charge section and 36.7% at the bottom of charge section, while maximizing effective stress at the collar section. Field trials demonstrated a 10% increase in advance per round and 40% reduction in half-barrel depth compared to original design, confirming substantial improvement in fragmentation efficiency and excavation precision.</p>

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Design Method and Application of Easer Hole Position Based on Blast Cavity Expansion Effects

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • Xue Luo,
  • Shuyi Song,
  • Min Gong,
  • Haojun Wu,
  • Xiaodong Wu

摘要

Rational planning of easer hole layout is of significant importance for improving blasting performance. This study proposes a novel design methodology for easer hole positioning by introducing the concept of Area Increment Ratio per Row (AIRR), which regulates the progressive variation in rock fragmentation area across successive rows to determine the collar and toe positions of each easer hole. The methodology comprises three key components: (1) calculation of easer hole row numbers, (2) allocation of rock-breaking area per row, and (3) geometric positioning of easer holes. Through numerical simulations calibrated with field blasting conditions, the optimal AIRR was identified as 0.1. Under this ratio, the proposed layout achieved 53.2% effective damage rate at the end of charge section and 36.7% at the bottom of charge section, while maximizing effective stress at the collar section. Field trials demonstrated a 10% increase in advance per round and 40% reduction in half-barrel depth compared to original design, confirming substantial improvement in fragmentation efficiency and excavation precision.