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<p>Coal seam water injection simultaneously mitigates methane emissions, respirable dust, and rock burst risks in underground mines. This study treated anthracite specimens with varying ultrasonic power and duration. The resulting pore structure and fracture morphology were analyzed using nuclear magnetic resonance (NMR) and laser scanning microscopy. Furthermore, water migration behavior was assessed through coupled seepage-imbibition tests. The results show that ultrasonic excitation caused widespread cavitation erosion on the coal surface. This process enhanced the connectivity of pre-existing fractures. Following the treatment, the saturated water absorption of coal did not change significantly. However, the water imbibition rate increased substantially by 46% to 63%. Furthermore, ultrasonic power and injection pressure demonstrated a synergistic effect on permeability. Under 1 MPa injection pressure, the permeability difference between 800 and 1600 W excitation reached 107.1%. This difference narrowed to 33.5% and 57.7% when the pressure was increased to 2 MPa and 3 MPa, respectively. However, excessively high pressure, power, or prolonged excitation time were found to reduce permeability. Therefore, further research into the synergy between ultrasonic and injection parameters is crucial. It will be key to advancing ultrasound-enhanced water injection for disaster prevention.</p>

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Evolution of seepage and imbibition in anthracite fracture under ultrasonic power

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月20日

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  • Qiming Huang,
  • Bo Yu,
  • Hongzhan Liu,
  • Gang Wang,
  • Xu Wang,
  • Ting Liu,
  • Hao Xu,
  • Haonan Shi,
  • Yuting Yan

摘要

Coal seam water injection simultaneously mitigates methane emissions, respirable dust, and rock burst risks in underground mines. This study treated anthracite specimens with varying ultrasonic power and duration. The resulting pore structure and fracture morphology were analyzed using nuclear magnetic resonance (NMR) and laser scanning microscopy. Furthermore, water migration behavior was assessed through coupled seepage-imbibition tests. The results show that ultrasonic excitation caused widespread cavitation erosion on the coal surface. This process enhanced the connectivity of pre-existing fractures. Following the treatment, the saturated water absorption of coal did not change significantly. However, the water imbibition rate increased substantially by 46% to 63%. Furthermore, ultrasonic power and injection pressure demonstrated a synergistic effect on permeability. Under 1 MPa injection pressure, the permeability difference between 800 and 1600 W excitation reached 107.1%. This difference narrowed to 33.5% and 57.7% when the pressure was increased to 2 MPa and 3 MPa, respectively. However, excessively high pressure, power, or prolonged excitation time were found to reduce permeability. Therefore, further research into the synergy between ultrasonic and injection parameters is crucial. It will be key to advancing ultrasound-enhanced water injection for disaster prevention.