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Covered trench – Tranchée Couverte Meyrin Village (Switzerland)

Covered trench – Tranchée Couverte Meyrin Village (Switzerland)

Tunnels and underground structures

  • Project Owner : Etat de Genève (Suisse)
  • Mission : Maîtrise d’œuvre complète
  • Cost of the works : 70’000 kCHF
  • Cost of the mission : 4’400 kCHF
  • Mission date : 2005-2011


The Meyrin cut-and-cover project was part of the final stages of work on the Tram-Cornavin-Meyrin-CERN (TCMC). The aim was to improve traffic flow in the village of Meyrin (25,000 v/d) and to build the extension of the tram towards CERN. The route de Meyrin was buried by means of a covered trench. The tram tracks were built on the backfilled slab.

The works involved the creation of :

  • A 715-metre-long cut-and-cover tunnel,
  • Two 95-metre-long traffic hoppers,
  • An area of technical premises dedicated to the structure’s operating systems,
  • Two 3.50-metre traffic lanes,
  • Three SOS niches
  • Three emergency exits

Technical characteristics :

  • Moulded walls 60 cm and 80 cm thick (17,800 m2),
  • 80 cm diameter bored piles (2,000 ml),
  • Concrete (15,950 m3), reinforcement (1,250 tonnes),
  • Temporary nailed wall supports (400m2),
  • Top-down construction (27,500 m3 of earthworks),
  • Open and lined trenches (56,100 m3),
  • Pavement structure (6,000 m3), bituminous surfacing (1,970 t),
  • Installation of sewerage and drainage networks (24,500 ml),

The main constraints of the project were as follows:

  • Maintaining access to the village centre for shops and emergency services despite the cramped nature of the site,
  • Maintaining traffic flow on the existing cantonal road during the works,
  • Existing networks to remain in service
  • Proximity to the plumb lines of existing buildings.



As a civil engineer and geotechnician in a multi-disciplinary consortium, GEOS carried out a complete project management mission including the following services:

  • Preliminary design,
  • Final design,
  • Application for planning permission,
  • Invitation to tender,
  • Execution project,
  • Construction management,
  • Commissioning and completion.

GEOS Ingénieurs Conseils, as leader of the GETM consortium, also carried out the following coordination tasks:

  • Administrative management of the project.
  • Coordination of the technical design of the structure.
  • Supervision of the project’s financial management.
  • Management of technical responsibilities: civil engineering, geotechnics, geology, waste management and special works.
  • Technical and administrative management of subcontractors for electromechanical equipment required for user safety, ventilation, lighting, signalling, video surveillance, fire detection and defence, acoustics and landscape architecture.




Posted on

27 July 2023