The blasting process on rock,the role of stemming mate ri al and the demage of bad stemming are expounded,the importance of stemming is ad ressed.

• 阐述了爆炸对岩石介质的破坏作用过程、炮泥堵塞的作用及无炮泥堵塞或堵塞质量不好的危害,说明了炮孔堵塞的重要性。