Application of Pre-extraction Drilling in Anti-burst of Low Permeability Coal Seam

In order to eliminate the outburst danger of coal seam with low gas permeability and consider the economic cost of anti-burst measures, the gas pre-extraction coal seam gas prevention technology in the coal roadway excavation process is studied to relieve the coal seam pressure and gas content. The pressure is reduced, and the gas content of the coal body is reduced to 8m³/t within the allowable excavation range. The maximum gas cuttings Smax of the gas is reduced to less than 6kg/m after the anti-burst effect test, which effectively eliminates the prominent danger of the coal seam. During the implementation of the regional anti-burst measures, it can assist the gas release from the gas release, reduce the gas content of the coal seam, release the gas potential of the coal body, and strictly implement the regional defense according to the requirements of the two "four-in-one" anti-burst measures. The comprehensive anti-burst measures supplemented by the sudden measures and the local anti-burst measures eliminate the prominent danger of the coal seam and ensure the safe excavation of the coal roadway. (paper)