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

Weidong Pan, Shaopeng Zhang and Yi Liu
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Weidong Pan: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Shaopeng Zhang: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Yi Liu: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

Energies, 2020, vol. 13, issue 4, 1-15

Abstract: 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 FLAC 3D 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.

Keywords: short distance; multi-coal seam; fully mechanized working face; numerical simulation; safe and efficient mining (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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