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<p>Detonation delay time and blasthole spacing critically influence excavation contour quality in rock blasting. This study introduces a novel nine-hole model that overcomes limitations of smaller-scale setups by better representing systemic interactions, minimizing boundary effects, and enhancing engineering relevance for simulating single-row pre-splitting blasting. Experiments examined the effects of delay time between the first (FBH) and subsequent blastholes (SBH), SBH-SBH spacing, and joint characteristics on crack paths, while strain was measured perpendicular to the borehole axis. Results show the optimal FBH–SBH delay (50&#xa0;µs) coincides with the period of maximum stress concentration on the SBH wall, promoting preferential crack initiation along the inter-hole axis. Continuous fractures formed when SBH-SBH spacing was within twice the FBH–SBH distance. Peak strain decayed following a power law function with distance, and joints reduced peak strain values at equivalent distances. These findings provide practical guidance for optimizing sequential controlled blasting parameters.</p>

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Study on Blast-Induced Crack Propagation in a Nine-Hole Model with Sequential Detonation Control

  • 期刊论文

  • 发表日期：

    2025年12月24日

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  • Da Mei,
  • Junhong Huang,
  • Xinping Li,
  • Yi Luo,
  • Tingting Liu,
  • Chunneng Yang

摘要

Detonation delay time and blasthole spacing critically influence excavation contour quality in rock blasting. This study introduces a novel nine-hole model that overcomes limitations of smaller-scale setups by better representing systemic interactions, minimizing boundary effects, and enhancing engineering relevance for simulating single-row pre-splitting blasting. Experiments examined the effects of delay time between the first (FBH) and subsequent blastholes (SBH), SBH-SBH spacing, and joint characteristics on crack paths, while strain was measured perpendicular to the borehole axis. Results show the optimal FBH–SBH delay (50 µs) coincides with the period of maximum stress concentration on the SBH wall, promoting preferential crack initiation along the inter-hole axis. Continuous fractures formed when SBH-SBH spacing was within twice the FBH–SBH distance. Peak strain decayed following a power law function with distance, and joints reduced peak strain values at equivalent distances. These findings provide practical guidance for optimizing sequential controlled blasting parameters.