Determination on Range of Stress-relaxed Area in Goaf of Low Permeability Single Coal Seam

According to the features of difficult gas pre-drainage and inefficient outbursts control in a low permeability single coal seam, in order to accurately deter mine the stress-relaxed area and realize fast driving in the stress-relaxed area of low permeability single coal seam, taking Guhanshan Coal Mine as an example, this p aper used many methods to determine the stress-relaxed area.The results showed that according to the determination of residual gas content and pressure in the coal s eam of adjacent goaf, in combination with numerical simulation, the range of the stress-relaxed area without outburst danger was 8 m, and in the stress-relaxed area, g as emission initial speed and value of drilling cuttings weight as well as desorption index for drilling cuttings were all below the critical value, which ilustrated the stress -relaxed area had no outburst danger, the fast and safe driving could be realized in the stress-relaxed area of low permeability single coal seam.