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<p>During roadway development at China’s Buliangou Coal Mine, a coal seam fold necessitated retreating the excavated roadway and constructing a new upward-inclined roadway, resulting in vertically overlapping roadways. To ensure the stability of the new roadway, this study investigates the deformation mechanisms and control strategies for the surrounding rock. A novel “compact backfilling + grouting modification” combined control technology was proposed. Theoretical analysis and numerical simulations were conducted to optimize critical parameters, including the elastic modulus of the filling body (0.9 GPa), grouting pressure (3&#xa0;MPa), and full-range compact backfill coverage. Deformation magnitude and range were used as evaluation criteria. Field trials demonstrated that the proposed method achieved a final roof-to-floor convergence of 12&#xa0;cm in the new roadway, confirming its effectiveness in stabilizing the overlapping roadway system. These findings provide actionable insights for roadway excavation and surrounding rock control under similar geological constraints.</p>

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Compact Backfilling + Grouting Modification Triangular Interlayer Deformation Control Technology in Overlapping Mine Roadways: A Study in Inner Mongolia’s Zhunger Coalfield

  • 期刊论文

  • 发表日期：

    2025年7月21日

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  • Guozhen Zhao,
  • Jiadong Li,
  • Wei Cheng

摘要

During roadway development at China’s Buliangou Coal Mine, a coal seam fold necessitated retreating the excavated roadway and constructing a new upward-inclined roadway, resulting in vertically overlapping roadways. To ensure the stability of the new roadway, this study investigates the deformation mechanisms and control strategies for the surrounding rock. A novel “compact backfilling + grouting modification” combined control technology was proposed. Theoretical analysis and numerical simulations were conducted to optimize critical parameters, including the elastic modulus of the filling body (0.9 GPa), grouting pressure (3 MPa), and full-range compact backfill coverage. Deformation magnitude and range were used as evaluation criteria. Field trials demonstrated that the proposed method achieved a final roof-to-floor convergence of 12 cm in the new roadway, confirming its effectiveness in stabilizing the overlapping roadway system. These findings provide actionable insights for roadway excavation and surrounding rock control under similar geological constraints.