Tunnels and underground structures

Brief description
and characteristics of the project

The study carried out by GEOS Ingénieurs Conseils is part of the construction of the A41 North motorway, section Geneva (Switzerland) – Annecy (Haute-Savoie – France).

Mission

GEOS provided assistance to the project owner, including :

  • External control of the design studies (EPOA, APOA) ;
  • Preparation of approval decisions
  • Auditing of execution studies and works;
  • Providing expert advice to the Technical Department.
  • Project Owner : ADELAC (Concessionnaire de l’autoroute A41 Nord)
  • Mission : Assistance à Maîtrise d’Ouvrage
  • Cost of the mission (projet global) : 187 k€ HT
  • Mission date : 2006-2008

Technical specifications:

  • 3000 m long twin-tube tunnel,
  • Tunnel excavated by tunnel boring machine Ø = 11.80 m in molasse.