What is closed-face tunnelling

[Mickeycc]

Q1) What is a closed-face tunnelling?

So far I know open-face tunnelling is the tunnel face of the ground being excavated will stand up with no support for a short period of time.

There is few common method to tunnel that i know:
1) TBM (Tunnel boring machine)
2) NATM (New Austrian Tunnelling method)
3) EARTH PRESSURE BALANCED MACHINE (EPBM)

Q2) So these method can be constructed in open-face or closed faced?

 

[cvg]

a blind shield is a full face shield with doors that can be opened to remove the material.

a full face shield covers the entire working face. Excavated material is removed by augers or as a slurry automatically. no personal can enter the excavation area. It includes both TBM and EPBM as well as others

 

[dicksewerrat]

Go to a few 'trade shows' on undergound construction and/or trenchless methods. There will be one in San antoio in Jan and one in Nashville in March. The vendors are all very knowledgeable. Also check out 'trenchlessonline'.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com