关键词: 地应力主导, 水力扩孔, 松软煤层, 掘进防突, 煤层蠕变

Abstract: Abstract: The 3# coal seam of Sangshuping Coal Mine in Hancheng Mining Area is a soft and thick coal seam. The coal and gas outburst is mainly caused by the ground stress. Based on the theory and field observation, the pore shape and stress distribution of the soft coal after different types of failure are analyzed. When the coal cutting rate is 3% by numerical simulation, the radius of the plastic failure zone around the borehole is about 2.2m, and the width of the plastic failure zone between the reaming boreholes is 1.6m;The width of the pressure relief area of a single reaming borehole is about 3.2m; the pressure relief effect of the hydraulic reaming technology is investigated on site, and the attenuation coefficient of the borehole gas flow is reduced by 3~4 times. The amount of gushing increased by 2~3 times; the evaluation of the effect of mine area measures was carried out by using the method of expanding the coal chip rate combined with the residual gas content. When the coal expansion rate is above 3%~5%, the geostress-oriented type of the Sangshuping coal mine can be effectively solved. The anti-burst problem of coal roadway excavation in soft and thick thick coal seam.