大采高工作面回采初期深孔预裂爆破弱化顶板技术

Technology of Weakening Roof by Deep-hole Presplitting Blasting in Early Mining Stage of Large Mining Height Working Face

针对大采高工作面回采初期坚硬顶板控制难题,以玉溪煤矿1301大采高工作面为工程背景,提出在工作面回采初期采用深孔预裂爆破技术对顶板岩层进行弱化,弱化了顶板岩层,缩短了来压步距,降低了来压强度。

In view of the difficult problem of hard roof control in the initial stage of large mining height face,taking the 1301 large mining height working face of Yuxi Coal Mine as the engineering background,it is proposed that the roof strata should be weakened by deep hole presplitting blasting technology in the early stage of working face.Weakening the roof strata,shortening the pressure step distance,and reducing the pressure strength.