Application on Permeability Improved Technology with Deep Borehole Energy Accumulation Blasting in Coal Seam

In order to improve gas drainage rate of low permeability coal seam,based on the gas geological conditions of Pingmei No. 10Mine,permeability improved technology with deep borehole energy accumulation blasting in coal seam was tested in No. Wu8. 9-20230working face. The coal seam permeability improvement effect was studied. The results showed that after carrying out the permeability improved technology with deep borehole energy accumulation blasting,gas drainage density of single borehole was 1. 55 ~ 2. 72 times of that before blasting,and gas drainage density in blasting influence area increased by 37. 64%. Furthermore,with the increase of blasting times and explosive charge length,gas drainage effect in blasting influence area was more obvious.