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<p>The effect of in‑situ stress on granite blasting through cut‑hole, caving‑hole, and peripheral‑hole experiments was investigated under biaxial confining pressures of 0, 5, and 10&#xa0;MPa. Fragmentation was quantified using a three‑parameter generalized extreme value (GEV) distribution, showing that the distribution slope increases from 0.608 to 1.095 and the proportion of large fragments rises from 69 to 94% as confining pressure grows. The depth-to-diameter ratio decreases (from 0.42 as low as 0.14) while the failure area on the specimen’s free surface expands with higher stress. Fractal analysis revealed that the fractal dimension of blast‑induced cracks in the surrounding rock declines from 2.00 to 1.21, indicating suppressed crack-network complexity at elevated pressures. Peak acceleration and strain measurements further demonstrated a reduced dynamic response under increased confining stress. Numerical simulations confirmed that redistributed in‑situ stress inhibits both radial and circumferential crack propagation. These findings offer guidance for optimizing tunnel blasting design in granite under low-to-medium in‑situ stress (0–10&#xa0;MPa) conditions.</p>

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Influence of In-Situ Stress on Granite Fractures by Blasting: Insight from Circular Tunnel Experiment and Simulation

  • 期刊论文

  • 发表日期：

    2025年8月27日

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  • Yong Fan,
  • Jingao Wu,
  • Guangdong Yang,
  • Wenbo Lu,
  • Dong Wei,
  • Lehua Wang,
  • Bin Tian

摘要

The effect of in‑situ stress on granite blasting through cut‑hole, caving‑hole, and peripheral‑hole experiments was investigated under biaxial confining pressures of 0, 5, and 10 MPa. Fragmentation was quantified using a three‑parameter generalized extreme value (GEV) distribution, showing that the distribution slope increases from 0.608 to 1.095 and the proportion of large fragments rises from 69 to 94% as confining pressure grows. The depth-to-diameter ratio decreases (from 0.42 as low as 0.14) while the failure area on the specimen’s free surface expands with higher stress. Fractal analysis revealed that the fractal dimension of blast‑induced cracks in the surrounding rock declines from 2.00 to 1.21, indicating suppressed crack-network complexity at elevated pressures. Peak acceleration and strain measurements further demonstrated a reduced dynamic response under increased confining stress. Numerical simulations confirmed that redistributed in‑situ stress inhibits both radial and circumferential crack propagation. These findings offer guidance for optimizing tunnel blasting design in granite under low-to-medium in‑situ stress (0–10 MPa) conditions.