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  Generic Model Creation 

INPUT Tunnel Examples 
ICDAS YouTube Channel   ICDAS GEN 2020.00R 

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Model description


BIM model

Analysis model





























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View(continued from Input Page 2)


In the next Revit views the profiles of gravel seabed, existing seabed, locking fill and portal building have been added to the Excel input by the rules above. Use nSTL to fit the associated length of each component along the tunnel. Finally, assign materials to the automated components for the results shown below.    


Figure: Perspective view.

The perspective view shows the five people inserted in the portal building. These people help the designer easy to identify geometry in the other views of the model.

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Figure: Floor Plan view, Transparency 50.  



In the Floor Plan view the transparency is set to 50 so we can see through the elements. The view range has the cut plane at Elevation 0 as the top of tunnel (fictive elevation). Section1 is created at 26.8m from the end of the portal building. The horizontal distances 20, 10, 70, 100m and so on are entered in (X, Y, Z) alignment where the locking fill has varying width for the portal building.

Figure: Elevation Left view.



In Elevation Left the vertical dimensions are measure in vertical direction. E.g. the thickness 300mm on top of the portal building is actually 299.899mm measured vertical when the decimals is turn-on. 300mm is the thickness perpendicular to the inclining tunnel at the two ends sections shown in Section1. For the vertical height 10.596m it is 10.600m input perpendicular to the inclining alignment. Only the horizontal dimensions are directly input in this case.

Figure: Section1 view, Transparency 50.



In Section1 set transparency to 50 to see through the elements so we can see the five people in the portal building on the left side. The horizontal distances 20, 10, 70, 100m of the STL are on top of the tunnel. The center tunnel section are 2.725m below Ref. 0, and the two side sections have a longitudinal slope of 2.725%. As a consequent of inclining, the two side sections are 100.037m length measured along element. As the profile is perpendicular to the inclining alignment, there is a gap of 242mm at the bottom between the side and the center section of the concrete tunnel.

Once the structural concrete section have been placed on the gravel seabed, the site concrete will be cast in the tubes on top of the bottom plate. The site concrete will have a varying thicknesses where the bottom is rectilinear connecting to the concrete tunnel, but the top surface is a smooth circular arc. The pavement for the traffic will be locating on top of the site concrete.

Curved or rectilinear sections?


Figure: Options of curved and rectilinear tunnel concrete sections.

In Excel input set (Radius, Length)=(3500, 300)m for the STL, the curved concrete tunnel is automated as shown above (left). For this option set STL=nSTL=0, and (X, Y, Z) alignment will not be used. On the right side the tunnel in the example is shown. The gap 242mm is measured at Section1 at the tube of roadway now 253mm at the railway.


Table below summerizes advantages/disadvantages for the above two options


Curved section

Rectilinear section

Curved reinforcement and curved formwork needed for concrete casting


Easy reinforcement and formwork

More equipment needed to move the curved sections to the water


Easy to move

Complicate to prepare the curved gravel bed on the seabed

Easy to prepare plan gravel bed on the seabed


Easy connect the sections on the seabed

Complicate to close the gaps between the concrete sections on the seabed


Constant ballast concrete thickness below the pavement inside the tubes

Varying ballast concrete thickness below the pavement inside the tubes



ICDAS Generic Model Creation provide parametric input to analyse further advantages and disadvantages for both options.



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Updated 04-08-2018

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123456789_123456789_1123456789ICDAS  •  Hans Erik Nielsens Vej 3  •  DK-3650 Ølstykke  •   E-mail: th@icdas.dk   •  Tel.: +45 60 53 83 79  •  CVR no.: 34436169