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<p>Rib spalling is a common hazard in underground coal mining, particularly as shallow coal resources in the eastern region of China become depleted. As mining shifts to deeper coal resources, especially in areas with thin bedrock and thick alluvium, rib spalling induced by overburden pressure and mining activity becomes more frequent and severe. This makes rib spalling a complex issue involving overburden behavior and mining techniques. To investigate the correlation between overburden movement and rib spalling in longwall mining panels with thin bedrock and thick alluvium, the 14,030 panel in Zhaogu No. 2 Coal Mine was selected as the research subject. A physical experiment was carried out to explore the relationship between the failure morphology of the overburden and rib spalling. The results indicate that rib spalling is primarily caused by strong impact loads resulting from the symmetric arch morphology of the overburden. Subsequently, a coupled support method was proposed based on numerical simulations using UDEC codes, combining flexible reinforcement techniques with optimized support stiffness. This method offers a practical and effective solution for mitigating rib spalling.</p>

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Overburden Fracture Propagation and Rib Spalling Control in Deep Longwall Mining with Large Panel Height

  • 期刊论文

  • 发表日期：

    2025年1月11日

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  • Zheng Li,
  • Meng Li,
  • Zhifeng Wang,
  • Pengju Liu,
  • Cheng Zhang,
  • Nevaid Dzimunya

摘要

Rib spalling is a common hazard in underground coal mining, particularly as shallow coal resources in the eastern region of China become depleted. As mining shifts to deeper coal resources, especially in areas with thin bedrock and thick alluvium, rib spalling induced by overburden pressure and mining activity becomes more frequent and severe. This makes rib spalling a complex issue involving overburden behavior and mining techniques. To investigate the correlation between overburden movement and rib spalling in longwall mining panels with thin bedrock and thick alluvium, the 14,030 panel in Zhaogu No. 2 Coal Mine was selected as the research subject. A physical experiment was carried out to explore the relationship between the failure morphology of the overburden and rib spalling. The results indicate that rib spalling is primarily caused by strong impact loads resulting from the symmetric arch morphology of the overburden. Subsequently, a coupled support method was proposed based on numerical simulations using UDEC codes, combining flexible reinforcement techniques with optimized support stiffness. This method offers a practical and effective solution for mitigating rib spalling.