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巷道掘进中掏槽炮孔组的深度、倾角和直径以及孔数和布置方式都各不相同。但炮孔组的孔深、孔径和孔数决定工作成本,以及考虑到规定时间内完成掘进循环工序的掘进机组的生产率。掏槽孔倾角通常决定采用可种凿岩设备(特别是在小断面巷道内)的可能性。在生产条件下可用几种途径增加掘进循环进尺:增加掏槽孔数;采用大直径补偿掏槽孔;爆破压合主要掏槽孔的孔口,为此要增加补充炮孔。
The depth, inclination and diameter of the undercut gunway group in tunneling and tunneling and the arrangement of holes are all different. However, the hole depth, the hole diameter and the number of holes in the hole group determine the work cost, and the production rate of the boring unit considering the completion of the driving cycle within the prescribed time. Pit angle usually determines the possibility of using rock drilling equipment, especially in small section roadways. In production conditions, there are several ways to increase excavation cycle footage: increase the number of cutting holes; use large diameter compensation cut hole; blasting press the main cut hole hole, to increase the additional hole.