What is shallow? What are the advantages and disadvantages of shallow blasting?

A blasthole with a depth of less than 5 m and a diameter of less than 50 mm is called a shallow eye. It is mainly used for various wells, lanes and tunnels, as well as shallow-eye collapse.

Mechanical advantage is that it uses mainly air-leg or a hand-held rock drill and a drill rig operation technique is simple and easy to use; in the absence of mechanical drilling, drilling may manually play brazing, increases the adaptability; For different blasting purposes and engineering needs, it is easy to control the blockiness of the blasting rock and limit the damage range of the surrounding rock by adjusting the position of the blasthole and the amount of charge.

The disadvantages are: mechanized engineering is not high enough, workers have high labor intensity, low labor productivity, frequent blasting operations, and heavy management work.