Re-use of immersed tunnels

An innovative method for recovering, regenerating and reusing immersed tunnels by temporarily re-floating

Master thesis (2020)

Authors

R.A. de Jong Civil Engineering & Geosciences

Contributors

M.Z. Voorendt Hydraulic Structures and Flood Risk - CEG (supervisor 1)
Sebastiaan N. Jonkman Hydraulic Structures and Flood Risk - CEG (supervisor 2)
E.J. Houwing Integral Design & Management - CEG (supervisor 2)
C.M.P. 't Hart Royal HaskoningDHV (supervisor 2)
Faculty
Civil Engineering & Geosciences
Copyright: © 2020 Arne de Jong
Circular design Re-use Immersed tunnels Tunnels Wijkertunnel Refloating Deepening
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Published Date

08-06-2020

Language

English

Reuse Rights

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Faculty

Civil Engineering & Geosciences

Abstract

Immersed tunnels, located in waterways, could be a limiting factor in the dredging in waterways. This dredging is required since cargo vessels draught increased the past decades. In this thesis a new method is defined for temporarily, effectively, re-floating immersed tunnels. With this method extra risks arise, for these risks’ measures are given. The validity of this method is proven by applying the method a relevant case study. This case tunnel is the Wijkertunnel, consisting of six elements and a total immersed length of 600 meters. It showed that the maximum deepening available is 6.60 meters. It is concluded that the impact of the risk measures is limited. Finally other immersed tunnels are compared to the Wijkertunnel. For these tunnels the different types are described, and the impact of these differences are discussed. It showed that for all the immersed tunnels the method is viable, except for immersed tunnels with a very few elements.