Port of Miami Tunnel

Design-build of a subsea road tunnel as part of a Public-Private Partnership (PPP)

Underground Works

United States, 2009-2014

General description

This twin-tube 1,260-metre-long structure directly links the Port of Miami to the motorway without going through the town centre. The project was awarded as part of a Public-Private Partnership (PPP) signed with the Florida Department of Transportation and presented a major challenge: the subsoil was partly composed of highly porous coralline limestone. The TBM was therefore modified during manufacturing to provide two tunnelling operating modes: earth pressure balance and a hybrid mode called Water Control Process. A precursor to the variable density mode, this involves mucking out a hybrid earth pressure balance TBM using a hydraulic process. Prior to tunnel excavation the porous limestone was grouted from a barge to ensure stability during boring. Another feature of the project: the tunnel is equipped with four massive flood gates weighing more than 55 tonnes that can close and hermetically seal the structure within a few minutes in the event of a hurricane.

Customer / concession authority: Florida Department of Transportation

Concessionaire’s official website

 

 

Consortium

BOUYGUES TRAVAUX PUBLICS

Project owner

M.A.T. (CONCESSIONNAIRE)

Locations

https://maps.google.fr/maps/ms?authuser=0&vps=2&ie=UTF8&msa=0&output=kml&msid=215408146226635276623.0004db182ef0699ffac55

Associated Projects

Toulon tunnel
Toulon tunnel

Construction of a road tunnel (connection between the A50 and A57 motorways in Toulon)

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New Tyne Crossing
New Tyne Crossing

Design-build of a new road tunnel, renovation of an existing tunnel, construction of an interchange and two toll plazas as part of a Public-Private Partnership (PPP)

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Rostock Tunnel
Rostock Tunnel

Design-build of an immersed road tunnel as part of a concession project

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