Application of Gas Extraction Technology through Layer Drilling in Floor Drainage Roadway of Fully Mechanized Mining Face
In order to avoid gas exceeding the limit during roadway excavation,based on the geological conditions of the 3115 working face in Daping Coal Mine,the gas extraction technology application of the floor drainage roadway through layer drilling was studied by using the on-site testing method.The gas extraction drilling parameters and the layout plan of the extraction system were designed,and the gas extraction effect was analyzed based on 5 sets of cross layer drilling data.The average gas extraction net amount of the drilling hole reached 0.340 m3/min,the average gas volume fraction reached over 60%,and the residual gas content in the coal seam of the 3115 working face roadway was much less than 8 m3/t.The coal seam gas extraction effect was good.
fully mechanized mining facefloor drainage roadwaygas extractionsealing process
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