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Navigation of Tunnels

Published online by Cambridge University Press:  21 October 2009

C. J. Kirkland
C. J. Kirkland
Affiliation:
(Technical Director, Eurotunnel)
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Extract

A number of factors need to be understood initially.

(1) Alignment is based upon the use of light, though not on being able to see where you are going!

(2) The theory relies upon three dimensional co-ordinate geometry.

(3) The knowledge that junction error will increase with distance, together with the commercial need to keep construction time short, normally means tunnelling from the ends towards a junction in the middle.

(4) Difficulties arise because of short baselines and no intermediate fixes.

(5) Terminology needs some explanation. Thus desired alignment is designed and then set out in the tunnel. Post-construction, a wriggle diagram is prepared and final alignment computed.

Type
Research Article
Information
The Journal of Navigation , Volume 42 , Issue 3 , September 1989 , pp. 382 - 387
Copyright
Copyright © The Royal Institute of Navigation 1989

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