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<p>Coal resource extraction efficiency and safety remain critical challenges in mining engineering, particularly in deep-seated coal seam extraction under complex geological conditions. This study investigates the application of large-diameter twin-screw drilling technology in coal seam excavation, with a focus on its pressure relief and permeability enhancement mechanisms. Through integrated theoretical analysis, numerical simulation, and field implementation, the research demonstrates that this innovative technology can significantly enhance coal permeability, mitigate stress concentration, and thereby improve both extraction efficiency and operational safety. The numerical simulation model based on elastic mechanics and Mohr-Coulomb failure criterion reveals that twin-screw drilling effectively expands the stress-relief region through superimposed stress field interactions, reducing coal body fragmentation and dust generation. Field trial data demonstrates superior drilling quality with stable coal output, achieving an average coal yield rate of 1.28 tons per hour and a corresponding coal mass of 0.725 tons per meter. Furthermore, gray correlation analysis identifies the optimal parameter combination of drilling length (2&#xa0;m), radius (0.24&#xa0;m), and vibration acceleration threshold (≤ 3&#xa0;m/s²), which balances coal production maximization, stress tensor minimization, and ground settlement control. These findings collectively establish the technical superiority of large-diameter twin-screw drilling in deep-seated coal mining, offering innovative solutions for high-efficiency and safe coal extraction operations.</p>

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Based on Large-Diameter Twin-Screw Drilling: Coal Mining Performance Analysis

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Hui Liu,
  • Teng Shi,
  • Chaojie Du,
  • Yangbiao An

摘要

Coal resource extraction efficiency and safety remain critical challenges in mining engineering, particularly in deep-seated coal seam extraction under complex geological conditions. This study investigates the application of large-diameter twin-screw drilling technology in coal seam excavation, with a focus on its pressure relief and permeability enhancement mechanisms. Through integrated theoretical analysis, numerical simulation, and field implementation, the research demonstrates that this innovative technology can significantly enhance coal permeability, mitigate stress concentration, and thereby improve both extraction efficiency and operational safety. The numerical simulation model based on elastic mechanics and Mohr-Coulomb failure criterion reveals that twin-screw drilling effectively expands the stress-relief region through superimposed stress field interactions, reducing coal body fragmentation and dust generation. Field trial data demonstrates superior drilling quality with stable coal output, achieving an average coal yield rate of 1.28 tons per hour and a corresponding coal mass of 0.725 tons per meter. Furthermore, gray correlation analysis identifies the optimal parameter combination of drilling length (2 m), radius (0.24 m), and vibration acceleration threshold (≤ 3 m/s²), which balances coal production maximization, stress tensor minimization, and ground settlement control. These findings collectively establish the technical superiority of large-diameter twin-screw drilling in deep-seated coal mining, offering innovative solutions for high-efficiency and safe coal extraction operations.