Abstract：Aiming at the safe and high-efficient mining problems of the seam that are high in-suit stress,low permeability and high absorbability in Dingji coal mine,the bedding long boreholes along coal seam for gas pre-drainage is adopted to relief gas outburst elimination in the working face and both walls. The deformation and failure characteristics of coal,gas flow characteristics and the change of stress concentration were simulated through RFPA-Gasflow around borehole,then reasonable gas drainage drilling parameters were acquired,and safe and effective measures were ensured. Holes diameter was determined as 133 mm combining with simulation results and on-site drilling conditions,and the horizontal and vertical maximum range of destruction around single borehole were 520 mm and 360 mm. The effect of pressure relief and outburst of coal body is remarkable in front face of driving working face.

Keyword：bedding long borehole;numerical simulation;gas pre-drainage;outburst elimination effect;gas aperture;