Study on Borehole Pressurized Sealing Technology for Gas Drainage Borehole in Mining Seam

According to the technical problems of the low gas content in the gas drainage and the borehole short effective drainage period in the mining seam of N 0.10 Mine in Pingdingshan Coal Mining Group, based on the analysis on the coal features, in combination with the available grouting technology, a technical method of t he borehole pressurized sealing was provided.The paper stated the basic principle of the borehole pressurized sealing.With the theoretical analysis, the technical para meters of the borehole pressurized sealing technology were set up.The three month industrial trial results showed that the application of the borehole pressurized seali ng technology could improve the gas drainage content from the mining seam by 30%55% and could expand the effective drainage time of the gas drainage borehole ab out 40 days.