Rapid seam opening technology of mine shaft sinking in 1000 m deep mine with high outburst seam group

According to the low permeability and high outburst features of the deep seam in Huainan Mining Area and the high danger during the seam opening proces s,based on the contiguous high outburst seams in East No.2 Mine Auxiliary Shaft of Panyi Mine as a study object and the detail and reliable previous exploration basic info rmation,as well as the mine shaft seam opening features of the high outburst seam group,there were two rings of the pressure releasing boreholes added. The design and construction were optimized. The combined gas drainage and outburst prevention measures of the multi seams were conducted. During the passing through seam section, perforated pipes applied to the borehole wall protection and the iron pipes applied to the metal support framework and other measures were made to ensure the gas draina ge quantity. The gas drainage mission was completed in advance and the online monitoring and measuring of the data were realized. The time of the borehole drilling.gas d rainage evaluation and seam opening completed of No.5-2 seam,No. 5-1 seam,No. 4-2seam and No. 4-1 seam in the mine shaft was 25 days in advance than the expecte d time and the safety and rapid seam opening in the mine shaft realized.