Improving the top coal recovery ratio in longwall top coal caving mining using drawing balance analysis

IF 2.7 3区工程技术 Q3 ENVIRONMENTAL SCIENCES International Journal of Mining Reclamation and Environment Pub Date : 2023-03-01 DOI:10.1080/17480930.2023.2184036

Liu Yang, Jiachen Wang, Shengli Yang, Lianghui Li, Shanxi Wu

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Abstract

ABSTRACT The recovery ratio of longwall top coal caving (LTCC) technology is an important measure of its effectiveness. However, the recovery ratio of single-opening sequential caving technology in thick and extra-thick coal seams needs improvement. To address this, an independent cluster-group caving technology is proposed in this study. Four numerical simulation experiments were conducted to compare the recovery ratio and drawing balance of four-opening independent cluster-group caving technology and single-opening sequential caving technology. Results show that the recovery ratio in four-opening independent cluster-group caving technology is approximately 6% higher than in single-opening sequential caving technology when the thickness of the broken gangue layer and the coal seam are the same. Additionally, a judgment formula for the broken immediate roof thickness is provided when the top coal recovery ratio is seriously affected. The independent cluster-group caving technology demonstrates stronger stability and better adaptability under different conditions, as its caving sequence can prevent larger thickness changes and gangue disturbances during the drawing process. Overall, this study highlights the potential of independent cluster-group caving technology to improve the recovery ratio of LTCC technology in thick and extra-thick coal seams.

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应用牵引平衡分析提高长壁综放开采顶煤回收率

长壁放顶煤技术的回采率是衡量其有效性的重要指标。但在厚煤层和特厚煤层单开序放顶煤技术的采收率有待提高。针对这一问题，本文提出了一种独立的簇群崩落技术。进行了4次数值模拟试验，比较了4孔独立簇群崩落法与单孔顺序崩落法的采收率和放矿平衡。结果表明:在破碎矸石层厚度与煤层厚度相同的情况下，采用四开口独立簇群崩落法采煤比单开口顺序崩落法采煤回收率高约6%;并给出了顶煤回采率受到严重影响时直接顶板破碎厚度的判断公式。独立簇群崩落技术在不同条件下稳定性更强，适应性更好，其崩落顺序可以防止放矿过程中较大的厚度变化和矸石扰动。综上所述，本研究突出了独立簇群崩落技术在提高厚煤层和特厚煤层LTCC技术采收率方面的潜力。

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来源期刊

International Journal of Mining Reclamation and Environment ENVIRONMENTAL SCIENCES-MINING & MINERAL PROCESSING

CiteScore

5.70

自引率

8.30%

发文量

审稿时长

>12 weeks

期刊介绍： The International Journal of Mining, Reclamation and Environment published research on mining and environmental technology engineering relating to metalliferous deposits, coal, oil sands, and industrial minerals. We welcome environmental mining research papers that explore: -Mining environmental impact assessment and permitting- Mining and processing technologies- Mining waste management and waste minimization practices in mining- Mine site closure- Mining decommissioning and reclamation- Acid mine drainage. The International Journal of Mining, Reclamation and Environment welcomes mining research papers that explore: -Design of surface and underground mines (economics, geotechnical, production scheduling, ventilation)- Mine planning and optimization- Mining geostatics- Mine drilling and blasting technologies- Mining material handling systems- Mine equipment