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Safe and Efficient Coal Mining Below the Goaf: A Case Study

School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
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Energies 2020, 13(4), 864; https://doi.org/10.3390/en13040864
Received: 7 January 2020 / Revised: 11 February 2020 / Accepted: 13 February 2020 / Published: 16 February 2020
Mining at the fully mechanized working face below the goaf of the short-distance coal seam is influenced by the upper goaf. To address this problem, methods such as theoretical analyses, numerical simulation, and on-site measurement are used to study the strata behavior characteristics of the Ningxia Lingxin Coal Mine 051508 working face in this study. The roof weighting intervals of the working faces below the goaf and the non-goaf are obtained via theoretical calculations. The stoping processes of the working faces below the goaf and the non-goaf are simulated with FLAC3D to obtain the distribution law of the bearing pressure and plastic zones before the working face. Based on the statistical analysis of the measured working resistance of the supports and its distribution, the roof weighting interval of the working face mining below the goaf is obtained. The results show that the roof weighting interval and the advanced abutment pressure during mining at the working face below the goaf are smaller than those below the non-goaf, providing a reasonable theoretical basis for mining below the goaf, and having important significance for safe and efficient mining. View Full-Text
Keywords: short distance; multi-coal seam; fully mechanized working face; numerical simulation; safe and efficient mining short distance; multi-coal seam; fully mechanized working face; numerical simulation; safe and efficient mining
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Pan, W.; Zhang, S.; Liu, Y. Safe and Efficient Coal Mining Below the Goaf: A Case Study. Energies 2020, 13, 864.

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