Deep-hole Pre-splitting Blasting Technology for High Gassy Deep Complex Geology Area and Low Permeability Coal Seam

This paper presents a experimental study by using the technology of deep-hole pre-splitting blasting in high gassy deep complex geology area of Wuyang Coal Mine, analyzes the effect of gas extraction and ascertains the influence radius of deep-hole pre-splitting blasting. The study results show that gas extraction concentration and gas extraction pure quantity respectively improve 1.28 to 1.87 multiples and 1.43 to 3 multiples, and that the influence radius of deep-hole pre-splitting blasting is 5 m and the optimal gas extraction radius is 3 to 5 m. Coherent crack net with a large area is engendered by the technology of deep-hole pre-splitting blasting in coal mass, which improves coal seam permeability.