Tunnel Construction¶
Construct Tunnel¶
Illustration of tunnel components and concepts
The dialog help for parametric tunnel description describes in more detail how you define the elements. The figure above shows the various concepts in connection with tunnels.
In Gemini Terrain we have three methods to describe the layers in a tunnel:
- Manual description
- Parametric description
- Combined description
Manual Tunnel Description¶
In manual tunnel description, we work with the concept of tunnel contour.
A contour can contain several layers, typically:
- 30: Tunnel (inner profile)
- 31: Tunnel blasting profile (perimeter)
- 32: Roadway
In addition to standard tunnel layers as described above, manual tunnel description also contains templates for the layers in a banquet. The possibility of using templates makes the manual method very flexible. You can define virtually any layers, for example guide edges and cable boxes, and then save these as a template for later use.
In a tunnel, you can have many tunnel contours, for example one for standard and one for niche. Furthermore, you must specify in which profile numbers the different contours should apply and how they should be rotated. Between defined tunnel contours, the program interpolates the values.
When you define tunnel layers and roadway, you can either retrieve standards as defined in handbook N500 Road Tunnels or enter values manually, for example from F-drawings.
Info
The dialog help for manual tunnel description describes in more detail how you define manual tunnel layers.
Parametric Tunnel Description¶
In parametric tunnel description, we do not work with the concept of contour. However, you can model the same layers:
- 30: Tunnel (inner profile)
- 31: Tunnel blasting profile (perimeter)
- 32: Roadway
Element 01: Trough always follows from the road model.
The tunnel layers are independent of each other (except for Parallel), and each description is defined with a logical name, as well as From - To interval (where the element should apply).
For each interval, you must specify a tunnel type, as well as indicate which surfaces in the road the tunnel element should attach to.
Example: Tunnel element attached to surface -2.01 on the left side.
The dialog help for parametric tunnel description describes in more detail how we define the elements.
Combined Description¶
The parametric method is less flexible than the manual method. Among other things, you cannot define layers for banquets and guide edges with this method.
With the combined method, you can describe standard tunnel layers (30-32) with parametric description and other layers such as banquets with manual description.
Tip
Use combined description when you need both the flexibility of the manual method and the efficiency of the parametric method.