Technical Research on Gas Control in High Gas Medium Thick Coal Seam Workface by Using Stratified Drilling and Extraction Method
In response to the problem of large gas emission and difficult control in high gas and medium thick coal seam working faces,a comparison was made between commonly used extraction methods,and the most suitable layer drilling extraction method was selected.On the basis of analyzing various factors that affect the extraction effect,such as drilling layout,sealing depth,negative pressure and extraction time,the extraction of high gas medium thick coal seam working face is designed and the gas extraction parameters are optimized.Practical applications have shown that the drainage efficiency of the layer by layer drilling method in the 3102 working face is as high as 62.71％,greatly reducing the safety hazards of high gas and medium thick coal seams,which is of great significance for controlling gas disasters.
layer by layer drillinghigh gas contentmedium thick coal seam
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