1) oblique cutting. The characteristics of oblique cut are: wide application range, good blasting effect, few blastholes needed, but the direction of blastholes is not easy to grasp, the perforation is limited by the cross-section size of roadway, and the throwing distance of gravel is large.
2) cut straight. The characteristics of straight hole cutting are: all blast holes are perpendicular to the working face and parallel to each other, and the technology is easy to master, which can realize simultaneous operation of multiple rigs or drilling jumbo operation; Among them, the hole without charge is used as the free surface and compensation space when the hole with charge is blasted, so the utilization rate of the hole is high; The throwing distance of gangue is small, and the rock pile is concentrated; Not limited by the size of the section. However, the total number of blast holes is large, the consumption of explosives is large, and the number of detonator segments used is large, so it can not be used in the working face with gas.