Tunneling

[Anonymous]

Hi

Does anyone know how to model a tunnel from a survey?.

The problem is that Civil 3D can not build a surface with points having the same coordinate and different elevation.

Sorry about my english.

[Neilw_05]

As you have noted, you cannot model a tunnel with a TIN (Triangulated Irregular Network), at least not with a single TIN. Depending on what you want to do with the surfaces you have a couple of options.

If you need to use the tunnel in C3D models you could create the tunnel in 2 halves by creating a TIN for the top and one for the bottom. Of course the 2 surfaces cannot be combined into a single surface as that would violate a rule of TIN's (any point can have only one elevation).

If you only need to visualize the tunnel for presentation purposes or perhaps some other non-C3D modeling you can use generic Autocad 3D surfaces and Solids.

[Anonymous]

Thanks for your answer.

The way of creating the tunnel in two halves can work, because i need to elaborate section on each station, but is there another way to create the full tunnel once.

On google i found some information about an application, but is not available.

Bye.

[Neilw_05]

Since you said you were using a survey I assumed you had the top and bottom of the tunnel in survey data. The web link you provided is apparently a presentation for a custom tool for modeling a tunnel from a baseline. You should be able to model the tunnel without custom tools by utilizing corridors. You will need a baseline and profile and assemblies for the top and bottom half. The corridors would generate the top and bottom halves of the tunnel from which you could generate surfaces and show them in your cross sections, etc.

As I haven't done this I can't offer details for creating the assemblies. However a Google search for "Civil 3D Tunnel" has several results. I'm sure you can find a detailed answer there.

[andrewpuller3811]

Check out Sean Twomey's blog post here.

http://edgeofwedge.com/roads.php?p=84&more=1&c=1&tb=1&pb=1#more84

[NathanBee]

http://forums.autodesk.com/t5/AutoCAD-Civil-3D/bd-p/66/page/667

which has a link to Ove Cervin's method. Unfortunately this link is now broken. Even with The Wayback Machine, the images don't come up: http://web.archive.org/web/20070302085139/http://civilcommunity.autodesk.com/blogs/blog/6/

Nathan

[joantopo]

In that pdf:http://forums.autodesk.com/autodesk/attachments/autodesk/66/145379/1/Boletin_N%C2%BA6_Dise%C3%B1o_y_... the application is TCP TUNEL of APLITOP. http://www.aplitop.com/aplitop/subidas/Documentacion/TcpTunnel_CAD_es.pdf