The blasting technique research of improving the lump coal rate in the big gun adopts the surface

In order to improve the lump coal rate in the big gun adopts the surface, through four blasting scheme comparison, select split-second delay blasting scheme of slope hole of minor diameter medicine finally, and carry on theory analysis to its parameter and test on a small scale. Practice has proved that this kind of technology can obviously improve the lump coal rate, increase the security of constructing, have better economic and social benefits.