Study on Outburst Prevention Technology in Opening Seam with Serious Dangerous Outburst of Cross-cut

In order to solve the outburst danger increased and the long seam opening period during the seam opening occurred by the high ground stress, high stru cture stress and high gas pressure at the seam opening location of the geological structure zone, the lower seam permeability coefficient and the complicated geological conditions of the Songzao Mining Area, the application of the pilot exploration, the prediction and pre-warning, the high pressurized hydraulic slot cutting for the perme ability improvement, the pilot gas pre-drainage from the floor of the gateway, the ring metal support frame, the bolt-steel mesh-anchor-shotcreting reinforced support an d the asymptotic type comprehensive cross-cut seam opening technology were provided and applied to Yuyang Mine. The results showed that with the application of the comprehensive cross-cut seam opening technology, the gas average drainage density was improved by 59% than the average drainage density with no slot cutting bore holes.After the high pressurized hydraulic slot cutting, the average drainage pure quantity per borehole was improved by 2.92 times and the seam opening time was red uced by 17 days.