论文部分内容阅读
矿山井巷掘进中,掏槽爆破效率直接影响掘进进尺。我矿是采用火雷管起爆的矿山,在井巷掘进中经常出现掏槽“挤死”、炮眼利用率低的现象,尤其在围岩中(f=14～16)掘进更为严重。掏槽眼用火雷管起爆,各眼起爆的时间间隔长,后一眼爆破时就把岩碴以很高的速度崩落在前一眼的空间,造成“挤死”,使爆落的岩碴抛不出来,炮眼愈深问题愈严重。实践表明,掏槽部位的岩石被崩成粉状,已不是原来的岩石结构,并相互挤压的
Mining mine tunneling, cutting blasting efficiency directly affects the excavation footage. Mine mine is a mine detonated by a fire detonator. In the process of tunnel excavation, the phenomenon of undercutting of “undercutting” often occurs and the hole utilization rate is low. Especially in the surrounding rock (f = 14-16), the excavation is more serious. The taphole is detonated with a detonator and the detonation of each eye takes a long time. After the first explosion, the rock ballast breaks down in the previous space at a high speed, resulting in “crowding out” Out, the deeper the hole the more serious the problem. Practice shows that the rock at the cut site is collapsed into a powder, which is no longer the original rock structure and is extruded