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<p>The resonance effect of pulsed abrasive water jet plays a critical role in coal and rock failure, with pulse frequency and jet pressure being the key parameters governing fragmentation efficiency. Digital image correlation (DIC) was employed to investigate coal fracturing induced by pulsed abrasive water jet, in which the strain response of coal particles was used to characterize the resonance-induced failure behavior. The effects of pulse frequency and jet pressure on coal-breaking efficiency were systematically analyzed. The results show that the strain of coal particles initially decreases and subsequently increases with increasing distance from the impact surface. Under constant jet pressure, the resonance effect reaches its maximum when the pulse frequency approaches the first natural frequency (10&#xa0;Hz) of the coal. The strain amplitude of the particle in <i>xx</i>, <i>yy</i>, and <i>xy</i> directions increases by 60.8%, 83.0%, 80.2%, respectively, compared to the non-resonant frequency, and the depth of crack propagation increases by 32.8%. When the pulse frequency deviates from the natural frequency of the coal, the resonance effect weakens, resulting in forced vibration with reduced strain amplitude and loss of periodicity in the strain time-history response. Damage is mainly concentrated in the upper and lower regions of the coal, with limited cracking in the middle. This study reveals the synergistic role of resonance and stress-wave effects in coal fragmentation by pulsed abrasive water jet, providing a theoretical basis for optimizing jet parameters to achieve efficient coal and rock breaking.</p>

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Experimental Study on Coal Breaking by the Resonance Effect of Premixed Pulsed Abrasive Water Jet

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Yang Du,
  • Jianping Wei,
  • Changjiang Chen,
  • Huidong Zhang,
  • Lizhen Zhao,
  • Qincong Nan,
  • Yong Liu,
  • Mengyuan Wang,
  • Pengwei Xiao,
  • Kai Ling

摘要

The resonance effect of pulsed abrasive water jet plays a critical role in coal and rock failure, with pulse frequency and jet pressure being the key parameters governing fragmentation efficiency. Digital image correlation (DIC) was employed to investigate coal fracturing induced by pulsed abrasive water jet, in which the strain response of coal particles was used to characterize the resonance-induced failure behavior. The effects of pulse frequency and jet pressure on coal-breaking efficiency were systematically analyzed. The results show that the strain of coal particles initially decreases and subsequently increases with increasing distance from the impact surface. Under constant jet pressure, the resonance effect reaches its maximum when the pulse frequency approaches the first natural frequency (10 Hz) of the coal. The strain amplitude of the particle in xx, yy, and xy directions increases by 60.8%, 83.0%, 80.2%, respectively, compared to the non-resonant frequency, and the depth of crack propagation increases by 32.8%. When the pulse frequency deviates from the natural frequency of the coal, the resonance effect weakens, resulting in forced vibration with reduced strain amplitude and loss of periodicity in the strain time-history response. Damage is mainly concentrated in the upper and lower regions of the coal, with limited cracking in the middle. This study reveals the synergistic role of resonance and stress-wave effects in coal fragmentation by pulsed abrasive water jet, providing a theoretical basis for optimizing jet parameters to achieve efficient coal and rock breaking.