- Project Owner : ERE – EIFFAGE RAIL EXPRESS
- Project management : CLERE – CONCEPTION LIGNE EIFFAGE RAIL EXPRESS
- Mission : Mission G2 : Etude terrassements + fondations OA (conception) ; Mission G4
- Cost of the mission : 1 538 k€
- Mission date : 2011-2015
BRIEF DESCRIPTION AND CHARACTERISTICS OF THE PROJECT
The Bretagne – Pays de la Loire high-speed line (LGV) is an extension of the LGV Atlantique Paris – Le Mans. It crosses the Brittany and Pays de la Loire regions and the departments of Sarthe, Mayenne and Ille et Vilaine.
The total length of the route is 182 km, plus 32 km of connections to the existing network.
As part of this project, GEOS worked on section B, which is 30 km long and runs from Laval to Vitré.
MISSION
GEOS carried out G2-AVP & PRO studies in the design phase. These studies cover
- definition, monitoring and supervision of geotechnical surveys ;
- earthworks (stability of earthworks, reuse/upgrading of materials, construction provisions, geotechnical models);
- standard engineering structures (type of foundations, construction provisions, etc.);
- the Vicoin causeway (a non-standard engineering structure comprising nine spans with a total length of 260 m).
The design assignment was supplemented by a G4 geotechnical supervision assignment covering the design supervision (VISA) and construction supervision (DET) phases.
