Comprehensive Gas Control Technology of Coal Mining Face Short Distance to Protected Seam

Due to the short distance between the protected seams,during the mining operation in the protected seam mining face,great gas emitted to the coal mining face from the underlaid protected seam.Thus the gas emission was increased during the mining period.According to the condition,with the analysis on the gas emission law of the protected seam with a short distance to other seams,in combination with the actual conditions of No.4 Mine,the gas comprehensive control technology with the buried pipeline drainage in the goaf,the high level borehole gas drainage and the resistance increased adjustment sealing leakage was conducted.The gas content of the coal mining face during the coal production period stabilized at 0.27%～0.39% and the gas content over limit problem in the short distance protected seam mining face could be effectively solved.