Field book



Port of Miami Tunnel.

The JEAN LUTZ company, on behalf of its subsidiary JEAN LUTZ North America, was present in early December 2011 on the major project of the future port of Miami tunnel.

It was an opportunity for our French and American technicians to install our jetgrouting instrumentation on the machines of the Nicholson Construction group.  

The port of Miami is the largest in the world for passenger cruise and one of the most important for goods transportation.


With nearly four million passengers a year, nine million tons of cargo and more than a million containers passing through its docks, its economic influence extends throughout the south-eastern of the United States.

The geographical location of Miami is the source of many road infrastructure problems, particularly on the port area which consists of several islands. The road from the Dodge Island docks to the Interstate 395 (a highway), forces trucks and buses to pass through a part of downtown, causing many inconveniences.


The realization of a double tunnel of 1.2km (3900ft) between Watson Island and Dodge Island was decided to solve this problem. On the latter island, the tunnel will lead to the MacArthur Causeway, a highway connected directly to the I-395.

The tunnels will be dug at a maximum depth of 36m (120 ft) below sea level, with a diameter of 12.5m (41 ft).

One of the difficulties in achieving this work is linked to the geology of the area : the basement consists of limestone beds, sand and of a layer of porous rock (oolites substrate type with voids).

The Nicholson company has been appointed to fill these spaces by using a specific mixture of slurry and the help of a drilling barge with double containment to prevent the pollution of the canal separating the two islands.

The drilling machines are equipped with the JEAN LUTZ instrumentation (LT3 and TARALOG Turbojet) to record the different measures delivered by the sensors during the execution of the injection work (Jetgrouting).  


The twin tunnels should be operational in May 2014.




Photo credit : picture 1 © FloridaStock - Fotolia.com / picture 3 : Copyright © 2011 Florida Department of Transportation / pictures 2, 4 and 5 © Jean Lutz SA