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<p>Top coal caving mining is one of the important mining technologies for thick coal seam mining. With the advance of the working face, some fully mechanized top-coal caving seams will have coal thickness changes, which will have a great impact on the top-coal recovery rate. Based on the 2113 working face of Shanxi Huajin Jining Coal Industry Co., Ltd., this study designed the coal caving process scheme with different mining height (1.0 ~ 3.5&#xa0;m) and mining-to-caving ratio (1:0.4 ~ 1:1.4). Through discrete element numerical simulation, the movement of overlying strata and top coal, the shape change of top-coal caving body and the change rule of top-coal recovery rate under different mining height and mining-to-caving ratio were analyzed, and the reasonable caving parameters were determined. The experimental findings demonstrate that in the thick-seam section of the face periphery unaffected by mining-induced effects, the optimal cutting-to-caving ratio ranges between 1:0.6 and 1:0.4. For the thin-seam section in the face interior subjected to upper-seam extraction impacts, the preferred cutting height is confined to 3.0–3.5&#xa0;m.Through iterative refinement of these parameter ranges, the optimized caving strategy achieves maximum operational efficiency: peripheral section: cutting height = 3.8&#xa0;m/Caving height = 2.4&#xa0;m, Interior section: cutting height = 3.5&#xa0;m/caving height = 0.5&#xa0;m. This configuration yields a peak resource recovery rate of 81.2%. The research results verify the feasibility of the segmented optimization process of different thickness coal seam and provide technical reference for the safe and efficient mining of complex variable-thickness coal seam.</p>

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Zonal-adaptive caving control technology and its mechanisms for improving extraction efficiency of variable-thickness seams

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Jinwang Zhang,
  • Xinyang Li,
  • Xiaohang Wan

摘要

Top coal caving mining is one of the important mining technologies for thick coal seam mining. With the advance of the working face, some fully mechanized top-coal caving seams will have coal thickness changes, which will have a great impact on the top-coal recovery rate. Based on the 2113 working face of Shanxi Huajin Jining Coal Industry Co., Ltd., this study designed the coal caving process scheme with different mining height (1.0 ~ 3.5 m) and mining-to-caving ratio (1:0.4 ~ 1:1.4). Through discrete element numerical simulation, the movement of overlying strata and top coal, the shape change of top-coal caving body and the change rule of top-coal recovery rate under different mining height and mining-to-caving ratio were analyzed, and the reasonable caving parameters were determined. The experimental findings demonstrate that in the thick-seam section of the face periphery unaffected by mining-induced effects, the optimal cutting-to-caving ratio ranges between 1:0.6 and 1:0.4. For the thin-seam section in the face interior subjected to upper-seam extraction impacts, the preferred cutting height is confined to 3.0–3.5 m.Through iterative refinement of these parameter ranges, the optimized caving strategy achieves maximum operational efficiency: peripheral section: cutting height = 3.8 m/Caving height = 2.4 m, Interior section: cutting height = 3.5 m/caving height = 0.5 m. This configuration yields a peak resource recovery rate of 81.2%. The research results verify the feasibility of the segmented optimization process of different thickness coal seam and provide technical reference for the safe and efficient mining of complex variable-thickness coal seam.