Research on the Mechanism of Coal-Wall Spalling and Flexible Reinforcement in Soft-Coal Seams Based on the Mogi–Coulomb Criterion

Wenjie Zhao, Hongbao Zhao (), Lu Gao and Yubing Liu ()
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Wenjie Zhao: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Hongbao Zhao: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Lu Gao: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Yubing Liu: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China

Sustainability, 2024, vol. 16, issue 24, 1-21

Abstract: The problem of soft coal-seam wall spalling is more prominent in the deep mining process, which seriously restricts the safety and sustainability of mining. The horizontal ground stress is usually ignored in the analysis of the coal-wall spalling mechanism. In this paper, based on the Mogi–Coulomb criterion and limit-equilibrium analysis, it is found that the traces of coal siding can be approximated as linear. The safety-stability coefficient of a soft-coal wall under the limit-equilibrium condition is obtained by applying the Mogi–Coulomb criterion. The coal stability of different positions is quite different. The coal with greater cohesion is more stable. In this regard, the cohesion of the coal can be improved through flexible reinforcement so as to improve the stability of the coal body. The control mechanism of the grouting and flexible rope reinforcing technology for the coal-wall spalling in the soft-coal seam is revealed. The safety-stability coefficient of the reinforced coal wall and the limit-stability coefficient are deduced. The reinforcement effect is related to the aperture ratio, the ultimate tensile force of the flexible rope, and the layout spacing. Reasonable aperture ratio, layout spacing, and flexible rope selection are key to reinforcement. This study has important guiding significance for the sustainability and safety of mining by revealing the mechanism of coal-wall spalling and reinforcement.

Keywords: coal-wall spalling; Mogi–Coulomb criterion; limit-equilibrium analysis; safety-stability coefficient; flexible reinforcement technology (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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