关键词: 导硐布孔, 掏穴扩孔, 截流抽采, 垂直钻孔爆破, 密孔切槽

Abstract: Compared with ordinary stone gate uncovering coal, long-distance coal uncovering in inclined shaft is high risk and difficult. In order to ensure that the shaft safely and efficiently passes through the outburst coal seam, the technical difficulties for long-distance coal uncovering of inclined shafts were analyzed, and safety measures for uncovering outburst coal seam proposed, based on the geological exploration results, support design and measured gas parameters of the coal seam No.3 in the coal uncovering area. By using the guide tunnel hole layout, a comprehensive enhanced extraction technology system of "six in one", such as increasing the hole depth with large aperture, multiple " burrowing holes ", casing down, high negative pressure, gas lift reverse circulation slag cleaning, and curing intercept extracting, has been put forward, which significantly improves the construction quality of drilling, solves the problem of efficient extraction of long distance exposed strong outburst coal seam in inclined shafts, and effectively controls the amount of gas emission after exploding.The method of vertical uncovering strong outburst coal seam at one time in inclined shaft is adopted, which significantly increases the range of uncovering coal at one time. The problem of roof and forming control in coal passing section is solved by the method of dense hole slotting for contour lines pretreatment for inclined shaft contour. It took 36 days from uncovering the coal seam No. 3 to passing through the coal seam at the vertical distance of 3 m. The maximum gas concentration in the working face after the blasting was 0.68%, and the maximum gas concentration in the return air flow was 0.36% during uncovering the coal. The operation of inclined shafts uncovering coal was successfully carried out, which provides important reference significance for long-distance uncovering outburst coal seams under similar conditions.