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<p>Understanding stress distribution, deformation, and fracture mechanisms around cavities or filling materials under impact loads is essential for evaluating the dynamic stability of coal and rock formations, particularly in roadways and backfilled boreholes. In this study, 60 coal samples with 4 different filling modes were tested using a split Hopkinson pressure bar (SHPB) system at various impact velocities. High-speed cameras coupled with digital image correlation (DIC) technology were employed to capture fracture processes, while an acoustic emission (AE) system monitored energy evolution during testing. The results reveal that: (1) Filling materials significantly enhance dynamic strength and wave impedance, modify crack propagation paths, and inhibit cracking within the coal matrix, (2) polyurethane grouting significantly reduces stress concentrations in filled holes and improves impact resistance compared to cement grout, (3) filled samples exhibit higher energy dissipation ratios than unfilled ones, and strain rate influences the effectiveness of filling materials in mitigating stress. The findings provide guidance for optimizing filling materials to enhance roadway and borehole stability in coal mining.</p>

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Dynamic Behavior and Energy Evolution of Coal with Varying Filling Materials Under Impact Loading

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Yongzheng Wu,
  • Junchen Li,
  • Penghe Zhou,
  • Yukai Fu,
  • Zhuoyue Sun,
  • Sifeng He

摘要

Understanding stress distribution, deformation, and fracture mechanisms around cavities or filling materials under impact loads is essential for evaluating the dynamic stability of coal and rock formations, particularly in roadways and backfilled boreholes. In this study, 60 coal samples with 4 different filling modes were tested using a split Hopkinson pressure bar (SHPB) system at various impact velocities. High-speed cameras coupled with digital image correlation (DIC) technology were employed to capture fracture processes, while an acoustic emission (AE) system monitored energy evolution during testing. The results reveal that: (1) Filling materials significantly enhance dynamic strength and wave impedance, modify crack propagation paths, and inhibit cracking within the coal matrix, (2) polyurethane grouting significantly reduces stress concentrations in filled holes and improves impact resistance compared to cement grout, (3) filled samples exhibit higher energy dissipation ratios than unfilled ones, and strain rate influences the effectiveness of filling materials in mitigating stress. The findings provide guidance for optimizing filling materials to enhance roadway and borehole stability in coal mining.