【摘要】 在巷道掘进现场试验研究中 ,根据北京矿务局大安山煤矿坚硬岩石赋存情况 ,改变岩石工作面平齐的传统采掘方法 ,利用直眼五星和菱形掏槽 ,采用中深孔爆破 ,使工作面保持凹形 ,既提高爆破效率又增加循环进尺 ,节省炸药消耗量。更多还原

【Abstract】 According to the condition of hard rock in Da Anshan mine of Beijing Mining Administration, the traditional digging method with a uniform advancing face is changed into a cutting type of straight five star and rhombus groove with the medium deep blasting in the experiment to keep the face being sunken The new cutting type can increase the working efficiency and cyclic advance, and save the consumption of dynamite at the same time更多还原