Application of Four Gas Drainage Measures in Mine Gas Safety Control:Taking Datong Coal Mine in Shanxi Province as an Example
Effective gas safety control is of great significance for the safe and efficient mining of coal mines.Taking Datong Coal Mine in Shanxi Province as an example,the application of different gas drainage measures in mine gas safety control was analyzed.In order to reduce the risk of high gas emission and outburst,the 10#coal seam was first mined as a protective coal seam,and then 7#,8#and 9#coal seams prone to outburst above it were mined.Four gas drainage control measures were proposed,namely cross drilling in the overlying coal seam,drainage from surface goaf well,roof drilling and roof gas drainage.The impact of these four measures on the gas emission,CH4 volume fraction and gas drainage amount of the 10#coal seam was investigated and analyzed.The results indicated that the cost of gas drainage in roof tunnels was high,and the drainage effect was poor,which can be effectively replaced by roof drilling.After optimizing the combination of drilling measures,it was found that the extraction efficiency of 7#,8#and 9#coal seams can reach 58.64%,and the gas pressure dropped to below 0.74 MPa.
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