矿井巷道注浆孔孔口成形爆破

COLLAR-SHAPING BLASTING OF GROUTING HOLES IN MINE DRIFT

金竹山煤矿托山工区巷道在掘进中被水淹没,需灌浆堵水;在注浆过程中,由于速凝灰浆引起注浆孔口下部结块,给进一步的灌浆堵水工作带来困难,需爆破炸掉结块部位,并将巷道顶部处孔口爆扩成喇叭状的漏斗口。

As the drift in Tuoshan work area of Jinzhushan Coal Mine was flooded while drifting, it was needed to block the water by grouting. But in the process of grouting, the quick-setting slurry resulted in agglomeration at the lower part below the collar of grouting hole so as to cause the work more difficult for further water-blocking by grouting. In this case, the agglomerated location had to be blasted and the collar, at the top of the drift, was blasted into a bell-shaped hopper consequentially.