Kérino under-river crossing

The study carried out by GEOS Ingénieurs Conseils is part of the project to build a tunnel under the river at Kérino to replace the existing movable bridge.

This route includes the construction of a 250 m under-river cut-and-cover tunnel and two access hoppers.

GEOS Ingénieurs Conseils carried out the G2 project-level studies and the G4 construction geotechnical supervision studies, as defined in standard NF P 94-500.

These studies covered the following points in particular:

• Establishment of the additional geotechnical campaign,
• Drawing up a note of general geotechnical hypotheses,
• Analysis of slope stability for the access hoppers,
• Evaluation of pumping rates during the construction and final phases,
• Assessment of vertical reaction moduli,
• Supervision of the execution studies for the cofferdams.