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在小断面隧道爆破中，减少炮眼与自由面的夹角，可以增加破碎度、岩石的爆落量和渣堆的松散度。而在实际上，在跨度不足3米的巷道里，楔形、锥形和扇形等掏槽法由于有较大的角度要求，凿岩台车施展不开，相互干扰大，很难实现；且炮眼深度浅，进度慢，满足不了机械化作业线生产率的要求；直线掏槽炮眼与掌子面垂直，相互平行，能弥补上述大角度掏槽的不足，且可加深炮眼，实行中深孔爆破，充分发挥“三车一机”机械化作业线的生产能力。
In the small section tunnel blasting, reducing the angle between the blasthole and the free surface can increase the degree of crushing, the amount of rock burst and the looseness of the pile. In fact, in the roadway spanning less than 3m, the wedge, taper and fan-shaped cutting methods, due to the larger angle requirements, can not be carried out by the rock drilling rigs and interfere with each other greatly. Shallow depth, slow progress, can not meet the requirements of the mechanized line productivity; straight cut hole and the palm face perpendicular to each other, parallel to each other, can make up for the lack of large-angle undercut, and can deepen the blasthole, the implementation of deep-hole blasting, full Play “three cars one machine” mechanization line production capacity.