Behaviour of the concrete lining in the Kielder Water Tunnels: Eurotunnel '83 Conference, Basle, Switzerland, Paper 6

Research output: Contribution to conferencePaperpeer-review

Abstract

Following excavation and temporary support, the 32-km long Kielder Water Tunnels were lined with concrete having a nominal thickness of 200 mm, giving a finished diameter of about 2.9 m. The rock loading on the concrete lining was assumed to be minimal over the vast majority of the tunnel since the surrounding rock was generally either self supporting or appeared to have been stabilized by the temporary support. To investigate this assumption diametrical deformations of the concrete lining and the strains that developed in the lining were measured at a number of locations along the tunnel in rock conditions that varied from a competent limestone to a fault gouge.
The measurements demonstrated that some significant deformation and loading of the permanent lining occurred where the tunnel was surrounded by very weak rock. The grouting operation was also found to have significantly loaded the lining in some places.
Shrinkage of the concrete, largely associated with hydration temperatures resulted in circumferential cracking of the lining. A survey showed significant variation in the severity of the cracking at different places in the tunnels. The reasons for this variation and suggestions for reducing cracking in continuously lined tunnels are discussed.
Original languageEnglish
Pages47-56
Number of pages10
Publication statusPublished - 1983

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