Inner Tunnel Profile

This is the dialog where you design your inner tunnel profile.

First, you must specify the name and the stationing/chainage interval for the inner profile. The name is just for making it easy to recognize the inner profile.

Then you must choose which type of inner tunnel profile you want to use. You do this by selecting a profile type from the Profile Type dropdown list.

If you choose Profile Library from the dropdown list, the button Read From Library becomes active. By pushing this button you get the possibility to select a profile from a profile library file. If you want to save the profile you are working with, click the Save To Library button.

Novapoint Tunnel supports 4 standard Norwegian profiles:

Parameters for standard profiles

When you choose one of the standard profiles, Novapoint Tunnel will give all of the parameter values. Most of the values are defined in tables in HB-021 and given on the illustrations in this dialog, but the variation of the angle alpha relative to the variation of the tunnel width is derived from the parameter tables in HB-021 for the two profile series. The following values are used:

Series Tunnel width interval [m] ∇alpha/∇width [Rad/m]

T5.5, T8.5, T11.5 5,5 ≤ width < 8,5 0,0403

8,5 ≤ width < 11,5 0,0638

11,5 ≤ width 0,0638

T7, T9.5, T12.5 7,0 ≤ width < 9,5 0.0576

9,5 ≤ width < 12,5 0.0472

12,5 ≤ width 0.0576


Parameters for general profiles

Novapoint Tunnel supports the possibility to define a general parametric profile in addition to the standard profiles. You can change the values of all relevant parameters by choosing the General Parametric profile from the dropdown list Profile Type. The illustration in the lower right corner explains the definition of the different parameters.

Connection and rotation points

The shape of the inner profile is decided both by the geometry parameters and by the Connection Points you choose. When choosing the connection points, you must be sure that these are the correct road surface edge lines to connect to for the whole interval of the inner profile.

You can decide whether the inner profile of the tunnel should follow the rotation (cross fall) of the road surface or not. When you specify a rotation of the inner profile, you must also specify which two of the road surface edge lines decide the rotation of the tunnel.

Wall Rotation

If you choose a general parametric profile with straight walls, then you will have the possibility to rotate these straight walls independently by clicking the Rotation of Straight Walls button. When you do so, a dialog opens where you can specify the rotation of each wall independently. You have three choices:

If you choose the wall to be independently rotated, you must specify the two road surface edge lines by which the wall rotation is defined. The wall will be normal to the line between these two road surface edge lines.

Note: To save the model to the tunnel geometry file, you must choose Save from the Define Tunnel Profile Geometry dialog.