The key technology of uncovering coal quickly on the shaft in the outburst coal seam group with high gas

The first auxiliary shaft of Panyidong project department is served for minting area above-850m,it will cross the high gas and outburst group be made of 13-1coal and 12coal. The In order to accelerate uncovering coal safely,a number of new technology of outburst prevention were adopted by Project department:At first,the coal seam gas pressure has been rapidly determined used the method of high gas inflation;At the same time,the self-developed corer was used to achieve complete coal-core,and the specific information of coal seam were mastered. After the uncovered coal has been verified and has no outburst,large diameter drillings were constructed by the expansion slot hole and were used to speed up the gas emissions. After a series of rigorous organization and tight construction,the whole process of uncovering coal is in less than 20 days,and nearly a third of the time was shorten compared with conventional process,a win-win situation of the economic and security benefits are gained.