Study on improving the penetrability of coal seam with the water pressure blasting in the through beds hole

The technology of water pressure blasting in the hole which is drilled from Yeqing coal seam to No.2 coal seam before mining the No.2 coal seam was researched in Niuerzhuang Mine Fengfeng Mining Bureau.The characters of water pressure blasting, traditional making crack with infuse and traditional making crack with blasting and the mechanism of water pressure blasting to cause split in coal seam were analyzed.The attenuation rule of natural flux and the change of methane from the hole fore-and-aft blasting were observed.Finally the results of experiment proved that water pressure blasting is the better method to improve the penetrability of coal seam effectively and the flux of the hole fore-and-aft blasting increase 3 doubles.