Abstract
Numerical Analysis and Prediction of Coal Mine Methane Drainage Based on Gas–Solid Coupling Model
Highlights
Coal mine methane (CMM) is a clean and highly efficient fuel
The gas–solid coupling model established in this study involves gas and stress fields
To obtain the distribution laws of the stress and the permeability of the coal seam around the borehole and the relationship between the effective influence radius and the drainage time, the gas–solid coupling numerical model was established in this study, and the method of solving this numerical model was given
Summary
Coal mine methane (CMM) is a clean and highly efficient fuel. it can cause serious disasters, which can threaten the safety of mine production [1,2,3,4,5]. Borehole drainage is one of the most effective means of extracting CMM It cannot only decrease the dangers of coal mining and obtain clean energy and reduce pollution [6,7,8,9,10]. The permeability of coal seams is one of the most vital parameters that can influence the seepage of gas in the coal rock It can directly affect the methane drainage efficiency of the borehole. When multiple boreholes operate simultaneously, the unreasonable distance between the boreholes will cause methane outburst to become incompletely eliminated in the zone of methane drainage by the boreholes, or the flow attenuation becomes very quick, affecting the methane drainage efficiency [13, 14]. To improve the methane drainage efficiency using boreholes and provide basis for the reasonable layout of the distance between boreholes, the relationship between the effective influence radius and the drainage time must be studied [15]
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