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<p>The 110 mining method has the dual advantages of resource conservation and safe, efficient operations. It is currently mostly used in coal seams with mining heights below 5&#xa0;m. Increased mining height raises the caving height of overlying strata, adversely affecting the stability of the retained roadway and altering the mechanical behavior of the short cantilever beam (SCB). Current theoretical research and support strategies for large-mining-height conditions remain inadequate. This paper establishes a mechanical model of the SCB. The main factors affecting the subsidence of the SCB are the mining height and the rotation angle of the upper roof, while the main purpose of the cable is to enhance the self-supporting capacity of the SCB. Similarity simulations with varying mining heights were conducted, incorporating monitoring of the retained roadway’s surrounding rock. The results show that under large-mining-height conditions, the subsidence of the SCB increases by 77.4%, while the peak stress in the coal rib rises by 21.4%. Based on an analysis of the cable-cutting interaction mechanism, a reinforcement technique for the SCB is proposed. The findings demonstrate that as the cable installation height increases from 8 to 20&#xa0;m, SCB subsidence decreases by 45.8%. When the cable height exceeds the cutting height, subsidence stabilizes at approximately 52&#xa0;cm. In cases where the cable height is lower than the cutting height, SCB subsidence declines with increasing support intensity. After field implementation, SCB deformation was effectively controlled within 56.2&#xa0;cm, and the condition of the retained roadway was satisfactory.</p>

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Deformation Mechanism and Cable Support Design Strategies of the Short Cantilever Beam in 110 Mining Method with Large Mining Height

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Xiaojie Yang,
  • Zhen Shi,
  • Yajun Wang,
  • Jun Zhang,
  • Yuwen Chen,
  • Qi Xu,
  • Gang Yang,
  • Feng Yang

摘要

The 110 mining method has the dual advantages of resource conservation and safe, efficient operations. It is currently mostly used in coal seams with mining heights below 5 m. Increased mining height raises the caving height of overlying strata, adversely affecting the stability of the retained roadway and altering the mechanical behavior of the short cantilever beam (SCB). Current theoretical research and support strategies for large-mining-height conditions remain inadequate. This paper establishes a mechanical model of the SCB. The main factors affecting the subsidence of the SCB are the mining height and the rotation angle of the upper roof, while the main purpose of the cable is to enhance the self-supporting capacity of the SCB. Similarity simulations with varying mining heights were conducted, incorporating monitoring of the retained roadway’s surrounding rock. The results show that under large-mining-height conditions, the subsidence of the SCB increases by 77.4%, while the peak stress in the coal rib rises by 21.4%. Based on an analysis of the cable-cutting interaction mechanism, a reinforcement technique for the SCB is proposed. The findings demonstrate that as the cable installation height increases from 8 to 20 m, SCB subsidence decreases by 45.8%. When the cable height exceeds the cutting height, subsidence stabilizes at approximately 52 cm. In cases where the cable height is lower than the cutting height, SCB subsidence declines with increasing support intensity. After field implementation, SCB deformation was effectively controlled within 56.2 cm, and the condition of the retained roadway was satisfactory.