Study on Outburst Elimination and Rapid Mine Roadway Construction Technology During Cross-cut Opened Structure Soft Coal

Analyzed the coal outburst mechanism occurred by the structure soft coal zone opened at the cross-cut, according to the outburst high danger and high strength problems occurred by the seam opened at the cross-cut, the pre-cracking blasting with deep boreholes in the structure soft coal zone for the outburst eliminati on and the rapid mine roadway construction technology were provided and the site test research was carried out in Luling Coal Mine.The results showed that with 24 ho urs after the deep borehole blasting, the drained gas volume fraction and the pure flow kept in long time was 23 times higher than the previous. The large cross section r oadway rapid construction technology with U type steel shield support applied could make the gateway cross section increase by 41% and ensured the mine safety prod uction.During the seam opened at cross-cut period, the gas content over the limit and the outburst accident was effectively eliminated, there was no coal wall spalling, r oof leakage and roof failing accident occurred and the time to open the seam reduced by 58 days.