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.