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<p>In western mining areas, roadways excavated in weakly cemented thick coal seams often experience significant deformation and support failure due to poor roof conditions, low cementation strength, and stress redistribution. Taking the 11,703 transportation roadway of the Dananhu No. 7 Coal Mine in Xinjiang as a case study, this paper investigates the deformation mechanisms of the surrounding rock and proposes an optimized support technology. Using numerical simulations, theoretical analysis, and field monitoring, the study reveals that roof failure evolves through stress redistribution, plastic softening, interlayer separation, and fragmentation, ultimately forming a 3.5&#xa0;m plastic failure zone. The existing support system fails to establish effective deep–shallow coordination, with shallow bolts yielding and deep cables underutilized. To address this, a Graded Anchor Composite Support Technology is proposed, consisting of surface concrete, shallow high pre-tensioned bolts, mid-depth short cables, and deep long cables. The optimized design enhances support performance and restricts plastic zone expansion. Field application and simulation results show a 73.3% reduction in roof subsidence and a 40% decrease in plastic zone depth. The study provides engineering guidance for roadway support in similar geological conditions.</p>

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Deformation mechanism of surrounding rock in weakly cemented thick coal seam roadways and research on graded anchor composite support technology

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年8月1日

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  • Jianxin Mao,
  • Yibo Fan,
  • Gangwei Fan,
  • Jianying Zhang,
  • Ziquan Wu,
  • Lilu Shan,
  • Shang Ren,
  • Hongfu Wang,
  • Chao Yang,
  • Yulong Wang

摘要

In western mining areas, roadways excavated in weakly cemented thick coal seams often experience significant deformation and support failure due to poor roof conditions, low cementation strength, and stress redistribution. Taking the 11,703 transportation roadway of the Dananhu No. 7 Coal Mine in Xinjiang as a case study, this paper investigates the deformation mechanisms of the surrounding rock and proposes an optimized support technology. Using numerical simulations, theoretical analysis, and field monitoring, the study reveals that roof failure evolves through stress redistribution, plastic softening, interlayer separation, and fragmentation, ultimately forming a 3.5 m plastic failure zone. The existing support system fails to establish effective deep–shallow coordination, with shallow bolts yielding and deep cables underutilized. To address this, a Graded Anchor Composite Support Technology is proposed, consisting of surface concrete, shallow high pre-tensioned bolts, mid-depth short cables, and deep long cables. The optimized design enhances support performance and restricts plastic zone expansion. Field application and simulation results show a 73.3% reduction in roof subsidence and a 40% decrease in plastic zone depth. The study provides engineering guidance for roadway support in similar geological conditions.