New Gas Drainage Technology of Single Outburst Seam in Pingdingshan Mining Area

The paper introduced the gas deposit law and the gas drainage technical system of Pingdingshan Mining Area and stated the study and application statu s of the gas drainage technology in detail, including the high pressurized hydraulic fracturing and permeability improvement technology, outburst prevention technology with high pressurized hydraulic borehole flushing, controlled standing blasting technology of deep borehole through strata, high pressure pulse water jet drilling and cutt ing integrated technology, high pressurized abrasives jet slotting outburst prevention technology, comprehensive gas control technology of separated source gas draina ge, the air moisture reversed rotary method to improve gas drainage rate and surface well drilling and gas drainage technology.The application of the above methods co uld effectively improve the gas pre-drainage rate.When the gas content S10 m3/t, > 10-15 m3/t and z15 m3/t, the gas pre-drainage rate of the outburst seam could reach >20%, >45% and >50%.