回转冲击钻进是一种比较新的钻进方法,其中回转方式碎岩是主要的,冲击脉冲碎岩是辅助性的。但是冲击具有重要作用,它可使岩石颗粒连接松弛,在岩石中产生疲劳应力,从而加速碎岩过程。根据大量的理论计算与实验研究证明:碎岩效果随冲击频率的增大而提高,因此建议冲击频率一般不低于2500冲次/分;碎岩效果随单次冲击能量的增大而提高,但有一个最优值,因为冲 Swing percussion drilling is a relatively new method of drilling, where gyratory rock fragmentation is dominant and rock fragmentation is secondary. But the impact has an important role, it can make the loose connection of rock particles, fatigue stress in the rock, thereby accelerating the rock breaking process. Based on a large number of theoretical calculations and experimental studies, it is proved that the effect of rockfill increases with the increase of impact frequency, so it is suggested that the impact frequency should not be lower than 2500 r.p.m./min; the effect of rockfill increases with the increase of single impact energy, But there is an optimal value because of red