The practice about deep hole pre-split blasting in mining faces of low permeability extra-thick seam

摘要

The rate of gas drainage is lower in mining faces of low permeability of extra-thick seam, and with lots of gas emission, which brings greater security risks. Through the Pre-pumping experiment of deep hole pre-split blasting for 216 mechanized mining face in Xiashijie coal mine of TongChuan coal group, increased the rate of gas drainage over 17% in working surface, that reduced potential safety problems during production, and indicated the direction for later gas government.