Analysis and application of gas emission correlation and ventilation safety in outburst coal seam driving face
Mastering the dynamic law of gas emission in the driving face is of great significance for the ventilation safety of the working face and the prevention and control of coal and gas outbursts.Therefore,three coal roadway driving faces at the lower coal pillar face of 21 in Daping Coal Mine were selected as the research object,and ANSYS simulation was used to analyze the distribution laws of air flow and gas in the working face,the gas concentration distribution was disordered on the cross sections 1 m and 3 m away from the heading face;at a distance of 10 m from the driving face,gas and air mix and flow uniformly,which was the best position to install a gas sensor to collect the driving dynamic gas emission;the correlation characteristics between gas emission in working face and driving operation process,operation shift,roadway length and coal wall exposure time were studied.The gas emission from the driving face mainly came from the coal wall,and there were two peak time points of gas emission:the first was in the coal caving and roof replacement operation process,and the second wave peak was in the middle coal caving and coal cleaning process.Through modeling simulation and analysis of main control factors,the specific location and time of gas dynamic outburst were accurately grasped.Targeted optimization plans were proposed from the aspects of ventilation monitoring,driving process,and extraction deployment,which have important reference value for safety management work such as coal and gas outburst risk prediction,gas extraction standard evaluation,and gas accident risk percep-tion in the working face.
coal and gas outburstnumerical simulationdynamic inversionassociation feature
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