TERRASOL was called upon by BOUYGUES to help them analyse the geotechnical conditions for the excavation of a tunnel under a sea channel in the Port of Miami.
This 11 m diameter twin-tube road tunnel passes approximately 15 m below the channel bottom and through extremely heterogeneous corraline ground, including one layer with very poor properties.
No tunnel of this size had been built in Florida through this kind of geological formation, which is extremely difficult to investigate and test given the high fragility of some layers.
A tough challenge for French (geo) technics! The tunnel was opened in August 2014 after an intensive campaign of soil treatment in aquatic environment.
- Expertise of the excavation conditions