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<p>The conditions under which coal production bases occur are characterized by shallow burial and the presence of multiple coal seams. This results in the overlying strata being disturbed multiple times, leading to increased deformation and the formation of cracks, which, in turn, cause air leakage. The air leakage allows gas to escape into the upper gob, resulting in low oxygen levels in the working areas of various production mines in the mining region. The problem of low oxygen levels stems from harmful gases leaking from the upper gob to the lower working face. To address this problem, an engineering concept known as a ‘man-made isolation layer’ was proposed, involving grouting and sealing the interlayer separation. By utilizing a rock movement model, precise calculations of the primary deformation of interlayer rock layers could be made. Additionally, the secondary movement deformation patterns of overlying rock in the gob during multi-coal-seam mining were determined. Mathematical models and numerical simulation techniques were employed to investigate the changes in deformation, porosity, and permeability of the overlying rock before and after filling the separation in the overlapping gob bed. The study also examined gas transport behavior and the impact of grouting and filling on this bed separation.The findings indicated that grouting and filling can effectively reduce the subsidence of overlying strata, decrease porosity and permeability, and limit the development of interlayer crack communication pathways. This method significantly contributed to the physical isolation of the upper and lower sections of the overlapping gob, resulting in a 40.9% and 32.8% reduction in interlayer air leakage, respectively, compared to the original levels.</p>

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Grouting and Sealing Bed Separation by Overlapping Mine Gobs in Multiple Seams for Improving Oxygen in Longwall Face

  • 期刊论文

  • 发表日期：

    2026年4月11日

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  • Jianwei Cheng,
  • Shuping Sheng,
  • Md Mojahidul Islam,
  • Dezhi Ran,
  • Marek Borowski

摘要

The conditions under which coal production bases occur are characterized by shallow burial and the presence of multiple coal seams. This results in the overlying strata being disturbed multiple times, leading to increased deformation and the formation of cracks, which, in turn, cause air leakage. The air leakage allows gas to escape into the upper gob, resulting in low oxygen levels in the working areas of various production mines in the mining region. The problem of low oxygen levels stems from harmful gases leaking from the upper gob to the lower working face. To address this problem, an engineering concept known as a ‘man-made isolation layer’ was proposed, involving grouting and sealing the interlayer separation. By utilizing a rock movement model, precise calculations of the primary deformation of interlayer rock layers could be made. Additionally, the secondary movement deformation patterns of overlying rock in the gob during multi-coal-seam mining were determined. Mathematical models and numerical simulation techniques were employed to investigate the changes in deformation, porosity, and permeability of the overlying rock before and after filling the separation in the overlapping gob bed. The study also examined gas transport behavior and the impact of grouting and filling on this bed separation.The findings indicated that grouting and filling can effectively reduce the subsidence of overlying strata, decrease porosity and permeability, and limit the development of interlayer crack communication pathways. This method significantly contributed to the physical isolation of the upper and lower sections of the overlapping gob, resulting in a 40.9% and 32.8% reduction in interlayer air leakage, respectively, compared to the original levels.