Numerical Simulation of Gas Drainage via Cross-Measure Boreholes in Deep Inclined Coal Seams

Qian Su, Taoyin Zhou and Peng Pei ()
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Qian Su: Guizhou Huada Geotechnical Engineering Co., Ltd., Guiyang 550025, China
Taoyin Zhou: Guizhou Mingchuang Heyuan Mining Technology Co., Ltd., Guiyang 550025, China
Peng Pei: Mining College, Guizhou University, Guiyang 550025, China

Energies, 2025, vol. 18, issue 16, 1-18

Abstract: This study addresses gas drainage challenges in the Pingdingshan NO.10 mine JI 15-16 coal seam through coupled COMSOL-FLAC 3D numerical simulations. The research evaluates the effectiveness of a cross-measure borehole drainage system. It analyzes the failure mechanisms of the surrounding rock in both the machine roadway and floor roadway of the 24130 working face under the influence of boreholes. The results demonstrate that extended drainage duration progressively reduces both gas content and pressure within the borehole-affected zone of the coal seam while enhancing the effective permeability of the JI 15-16 coal stratum. The operational system extracted 1,527,357 m 3 of methane, achieving a pre-drainage efficiency of 59.18% through cross-measure boreholes. The measured gas content aligns with simulated predictions, though field-recorded gas pressure registered slightly higher than modeled values. This validated drainage design complies with the Pingmei Group’s regulations for coal and gas outburst prevention. Critically, cross-measure boreholes alter stress distribution around both coal and floor roadways, promoting plastic zone expansion. Consequently, during the development of the 24130 working face’s machine roadway, intensified ground pressure monitoring is essential near borehole locations in the roof, floor, and rib strata. Supplementary support reinforcement should be implemented when required to prevent rib spalling and roof collapse incidents.

Keywords: gas extraction; cross-seam boreholes; numerical simulation; plastic zone extent (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: 2025
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