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井巷掘进中,一槽炮爆破的效果如何,在很大程度上决定于掏槽炮眼选择得恰当与否.在同一巷道断面条件下,采用同样的炮眼直径、炮眼深度、装药量,在相同的岩石中进行爆破时,好的掏槽炮眼排列方式能获得较好的爆破效果。合理的掏槽方式能为辅助眼的爆破创造良好的条件,就能提高一槽炮的炮眼利用率;就能增长每槽炮的有效进尺;就能使爆下的岩石块度小而均匀,石渣不会飞得过远而比较集中,有利于装岩;就能使爆破后的工作面光滑而整齐,有利于下槽炮的钻眼。相反,由于选择掏槽的方式不恰当,不仅不能按予定的目标爆下岩石影响进尺,不能按期完成任务,甚至还会给后一槽炮的钻眼爆破带来很大的不利,严重地影响到巷道断面的稳定性。正因为这样,一个好的掘进队组,总是对于炮眼排列,特别是掏槽眼的排列给予应有的重视。
Well tunneling, the effect of a slot blasting to a large extent depends on the choice of cutting hole is appropriate or not.Under the same tunnel section conditions, using the same hole diameter, hole depth, charge, in the When blasting in the same rock, a good blasting hole arrangement can get a better blasting effect. Reasonable undercutting can create good conditions for assisting the eye blasting, can improve the utilization of a hole shot blasthole; can increase the effective footage of each tank gun; can make the rock mass burst small and uniform, Gravel will not fly too far and more concentrated, is conducive to rock loading; can make the blasting face smooth and neat, is conducive to the next slot cannon drilling. On the contrary, because of the inappropriate choice of undercutting, it is not only not able to impact the rock under the target, but also can not fulfill the mission on schedule, and even greatly adversely affect the drilling blasting of the latter tank gun Stability to the tunnel section. Because of this, a good group of driving teams always give due attention to the arrangement of bores, especially the arrangement of bored eyes.