What is a cut fan?

In the case of explosion mining, there are a number of procedures that can be used to create the necessary access via rock or other substance. The holes are drilled to the surface in the strategic pattern and the explosives are inserted to achieve the desired explosion pattern. Cut the fan is one type of drilling and blasting pattern used in tunnel mining, which allows mining efforts to achieve additional free faces or clear drilling areas. As the drilling continues deeper into the tunnel, the fan cut can be reused to achieve another free face. The fan cut is named for the shape of the drill holes that are used, which forms an arch or a fan pattern on the V -shaped surface. In this situation, series openings can be drilled in an open face. The holes are located at the angles that cause the most breaking in the rock face to be able to achieveother layers of free face.

V -shaped cuts can be made on one another or side by side depending on the size of the tunnel and the type of device available. The fan cut helps to expand the available rock face by creating a ditch that allows deeper and deeper access to the rock face. The fan cut can be used in combination with several other slices or techniques depending on the tunnel structure, drilling the material and used explosives.

The fan cutting angle should not be too acute. However, if acute angles are required, there will be a need for stronger concentrations of explosives used in drilling holes. Ideally, the fan cuts should be more than 60 ° EC. Cuts can be made in a double Vee or as well as four times Vee if space is available. Explosions will also have to be distributed at least 50 milliseconds fromself to get enough time for swelling and relocation. This gives the explosion the impact of the most rock.