Deep Blasting (Old Method)¶
Use this dialog to define how the deep blasting layer should be constructed. In deep blasting, the rock is drilled and blasted to a level below the final excavation level (planum/trench bottom).
Where to Find the Dialog¶
In the toolbox, select SFI Properties..., then the Road tab, and the Substructure table.
Sections¶
Specify the sections for deep blasting using From Profile – To Profile. There is no limit to the number of sections (intervals). If there is a gap between two sections, no deep blasting will be constructed there.
Design¶
You can choose between four design types:
- Roof slope
- Single slope left
- Single slope right
- Slope left/right
Roof Slope¶
Figure: A = Depth
By default, the depth is the distance from the road surface to the blasting level. For roof slope, the depth applies at the centerline unless a reference surface is specified.
If the depth of the deep blasting layer at any point becomes less than the specified minimum depth, the deep blasting layer will be adjusted. The deep blasting plane will never be less than the specified minimum depth below the surface. The shape of the surface and the deep blasting determine where this point is located. In practice, it can be anywhere in the profile.
Single Slope to the Left¶
Figure: A = Depth
By default, the depth is the distance from the road surface to the blasting level. For single slope to the left, the depth applies under the outer edge of the last 2-surface (shoulder surface), unless a reference surface is specified.
If the depth of the deep blasting layer between surface -3.9999 and 3.9999 becomes less than the specified minimum depth, the deep blasting layer will be adjusted. The deep blasting plane will never be less than the specified minimum depth below the surface. The shape of the surface and the deep blasting determine where this point is located. In practice, it can be anywhere in the profile.
Single Slope to the Right¶
Figure: A = Depth
By default, the depth is the distance from the road surface to the blasting level. For single slope to the right, the depth applies under the outer edge of the last 2-surface (shoulder surface), unless a reference surface is specified.
If the depth of the deep blasting layer between surface -3.9999 and 3.9999 becomes less than the specified minimum depth, the deep blasting layer will be adjusted. The deep blasting plane will never be less than the specified minimum depth below the surface. The shape of the surface and the deep blasting determine where this point is located. In practice, it can be anywhere in the profile.
Slope Left/Right¶
Figure: A = Depth
The depth is the distance from the road surface to the blasting level. Different slopes for the left and right sides can be specified. For slope left/right, the depth applies at the centerline unless a reference surface is specified.
If the depth of the deep blasting layer at any point becomes less than the specified minimum depth, the deep blasting layer will be adjusted. The deep blasting plane will never be less than the specified minimum depth below the surface. The shape of the surface and the deep blasting determine where this point is located. In practice, it can be anywhere in the profile.
Width¶
Unknown width is indicated with - (hyphen) in the width field.
For unknown width, the following rules apply:
- If a rock cut exists, the deep blasting will extend to the cut with the extension to surface 5.01/5.02.
- If no rock cut exists, the deep blasting will, by default, go vertically to surface 4.09 (outermost 4-surface).
You can also choose to stop the deep blasting at a given surface for the left and right sides. The stop point will be the outermost point on the surface. From the stop point, the deep blasting goes vertically up to the trench.
Slope¶
If the slope is undefined and the design is Roof Slope, the program uses the slope from surface 1.01. If this does not exist, it uses -1.01, 1.02, or -1.02 in that order.
The program will not construct the deep blasting layer for other design types if the slope is undefined.
Reference Layer and Reference Surface¶
With these options, you specify which layer (default is trench) and which surface in the layer the depth should refer to.
VIPS Import¶
The import reads the contents of the VIPS table Deep Blasting.