A Note on Real Time Monitoring of Tunnel Invert Slabs During Stressing

The Burnley Tunnel in Melbourne is about 3.5km long and passes at a depth of about 60m beneath the Yarra River. In about mid-1999, prior to the tunnel being opened, problems, developed with the invert lining within parts of the tunnel. These problems were widely canvassed in the Media and aspects of the remedial works were published in the Melbourne Age. This article deals with a small technical facet of material which is in the public domain. It does not deal with matters which have been in dispute between various parties associated with the tunnel.

The simple objective of this article is to record the level of accuracy which can be achieved in real time survey monitoring within a tunnel.