The blastholes of the heading face can be divided into the groin, the auxiliary eye and the peripheral eye according to their use and location.
The auxiliary eye, also known as the collapsed eye, is a large number of blastholes that collapsed the rock and continued to enlarge the gutter. The auxiliary eye is evenly arranged between the pupil eye and the peripheral eye, and the direction of the blasthole is generally perpendicular to the working surface. The peripheral eye is the rock around the roadway, and finally the blasthole of the design of the roadway section is formed. In order to ensure the formation of the roadway and reduce the amount of support engineering, smooth blasting technology can be used.
The role of the auxiliary eye is to expand and extend the range of the gutter; the role of the peripheral eye is to control the shape of the cross section of the well. The blasting sequence must be delayed detonation, that is, the squirting eye is first blasted, then the auxiliary eye is detonated, and the surrounding eye is finally detonated. Â
The auxiliary eye, also known as the collapsed eye, is a large number of blastholes that collapsed the rock and continued to enlarge the gutter. The auxiliary eye is evenly arranged between the pupil eye and the peripheral eye, and the direction of the blasthole is generally perpendicular to the working surface. The peripheral eye is the rock around the roadway, and finally the blasthole of the design of the roadway section is formed. In order to ensure the formation of the roadway and reduce the amount of support engineering, smooth blasting technology can be used.
The role of the auxiliary eye is to expand and extend the range of the gutter; the role of the peripheral eye is to control the shape of the cross section of the well. The blasting sequence must be delayed detonation, that is, the squirting eye is first blasted, then the auxiliary eye is detonated, and the surrounding eye is finally detonated. Â
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