Research on Rapid Seam Opening of Cross-Cut Technology in Songzao Mine

According to the soft seam and poor seam permeability, high seam opening engineering of the cross-cuts and long time seam opening and other problem s in Songzao Mine, the deep borehole pre-cracking blasting technology and the high pressurized hydraulic slotting technology were applied.A study on the borehole patt ern and blasting parameters of the deep borehole pre-cracking blasting and the borehole pattern and hydraulics parameters of the high pressurized hydraulic slotting W as conducted individually.The application results showed that the rapid seam opening technology of the cross-cut with deep borehole pre-cracking blasting could reduce the borehole drilling with 806.7 m in average, the seam opening time could be reduced from 72.2 days to 32 days and the seam opening time could be reduced by 55. 3%.The rapid seam opening technology of the cross-cut with the high pressurized hydraulic slotting could reduce the borehole drilling with 905.7 m in average, the sea m opening time could be reduced from 72.3 days to 27.7 days and the seam opening time could be reduced by 61.2%.The above two methods both could solve the long time seam opening and high engineering problems and the effect of the seam opening technology with the high pressurized hydraulic slotting would be better.