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<p>The roadway instability and intense movement of overlying strata created by underground mining in thick coal seams seriously affect safe production and the surface environment. In response to these issues, this study systematically investigated the space compensation effect in goaf areas induced by roof directional pre-splitting technology (RDPT) and its control mechanisms on roadway stability and surface subsidence, employing a comprehensive approach that included theoretical derivation, physical experiments, numerical computations, and engineering verification. A goaf fragmentation-compensation equation and mining damage conservation law were established based on the short cantilever beam (SCB)-gangue expansion synergistic bearing model, elucidating the mechanical mechanism by which RDPT achieved immediate volume filling compensation through enhanced fragmentation expansion coefficients in the caving zone. Field tests demonstrated that compared to non-RDPT areas, RDPT implementation areas showed 0.8 increases in both initial and residual fragmentation expansion coefficients. Significant improvements were observed in key indicators: roof-floor displacement decreased by 50.5% (from 436 to 216&#xa0;mm), sidewall convergence reduced by 50.8% (from 392 to 193&#xa0;mm), and surface crack widths narrowed from 400–600&#xa0;mm to 0–100&#xa0;mm. The research confirmed that RDPT optimized the fragmentation coefficient to achieve dynamic space compensation in goaf, transforming overburden damage patterns from fracture-subsidence dominance to fragmentation-compensation dominance, which provided quantitative design criteria for green mining without coal pillars in thick coal seams.</p>

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Mining Space Compensation Effect on Roadway Stability and Ground Control by Roof Cutting

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Can Ming,
  • Manchao He,
  • Jiong Wang,
  • Jianning Liu,
  • Massimo Coli

摘要

The roadway instability and intense movement of overlying strata created by underground mining in thick coal seams seriously affect safe production and the surface environment. In response to these issues, this study systematically investigated the space compensation effect in goaf areas induced by roof directional pre-splitting technology (RDPT) and its control mechanisms on roadway stability and surface subsidence, employing a comprehensive approach that included theoretical derivation, physical experiments, numerical computations, and engineering verification. A goaf fragmentation-compensation equation and mining damage conservation law were established based on the short cantilever beam (SCB)-gangue expansion synergistic bearing model, elucidating the mechanical mechanism by which RDPT achieved immediate volume filling compensation through enhanced fragmentation expansion coefficients in the caving zone. Field tests demonstrated that compared to non-RDPT areas, RDPT implementation areas showed 0.8 increases in both initial and residual fragmentation expansion coefficients. Significant improvements were observed in key indicators: roof-floor displacement decreased by 50.5% (from 436 to 216 mm), sidewall convergence reduced by 50.8% (from 392 to 193 mm), and surface crack widths narrowed from 400–600 mm to 0–100 mm. The research confirmed that RDPT optimized the fragmentation coefficient to achieve dynamic space compensation in goaf, transforming overburden damage patterns from fracture-subsidence dominance to fragmentation-compensation dominance, which provided quantitative design criteria for green mining without coal pillars in thick coal seams.