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Contour Blasting

To calculate contour blasting, we must create a longitudinal profile where blasting will be performed. We must also know the level to which we will blast. For this, we have a tailored function. Based on a given surface, for example 4.1, in an SFI model, the function creates a 3D line that follows it, see figure below.

The 3D line is placed in a separate SFI model so that we can generate a longitudinal profile along it. The program suggests a name for this, which we can change if desired. After profile generation, we get a longitudinal profile at the bottom of the cut. We disregard the error resulting from the fact that the cut actually has a given slope.

A = Rock, B = Contour blasting

A mass type cannot use 3D lines directly. We are therefore required to create a theoretical layer for this line. Then we retrieve the mass type for contour blasting in the dialog for SFI properties.... In this mass type, the distance between the boreholes is defined (standard 0.5 meters), so that the number of running meters of contour blasting can be calculated.

Procedure

  1. Switch to plan view
  2. Mark the center line for the road
  3. Right-click and select Create line definition from surface no.
  4. Select for example Layer: 1:Trench and Surface: 4.2. Accept filename and click OK in the dialog
  5. Mark the new center line, right-click on the map and select Generate longitudinal profile from the context menu
  6. Select Add/create... in the horizontal list field for layer name
  7. Select Standard User-defined and call the layer Trench. Click OK
  8. Answer Yes to generate layer from center line in road model and height offset
  9. Enter 0 if the level is correct (no height adjustment) and click OK
  10. Select mass type for contour blasting in dialog for SFI properties...