Tunnels and underground structures
![](https://www.geos.fr/wp-content/uploads/2016/01/tunnel.png)
GEOS’ work in the field of underground structures covers new structures and those to be rehabilitated – tunnels, galleries, open and covered trenches, shafts, underground stations, collectors, avalanche barriers – in all sectors: roads, motorways, railways, high-speed lines, hydraulic projects, car parks, mines, and for a wide variety of clients: the state, local authorities, motorway concessionaires, public establishments and private companies.
GEOS has expertise in geonumerical and geotechnical modelling and calculations. Using high-performance 2D and 3D software, the modelling of underground structures takes into account complex behaviour laws, construction phases and soil-structure interaction in order to optimise design.
Roads, motorways
Parkings
Railways, high-speed lines
Hydraulic projects
![Arc de Dierrey (lot 1) – Crossing SNCF tracks (60)](https://www.geos.fr/wp-content/uploads/2016/03/Tunnel_Microtunnelier_Arc-de-Dierrey.png)
![Covered trench – Customs road – Geneva Airport (Switzerland)](https://www.geos.fr/wp-content/uploads/2016/07/TC-Route-douanière-Vue-TC-A-la-une-510x382.jpg)
![Covered trench – Tranchée Couverte Meyrin Village (Switzerland)](https://www.geos.fr/wp-content/uploads/2016/07/TC-Meyrin_Font-dattaque-1_A-la-une-510x382.jpg)
![Underground car park – World Trade Organization (WTO) – Switzerland](https://www.geos.fr/wp-content/uploads/2016/07/OMC_A-la-une-510x382.jpg)
![Semi-buried car park – Commune de Russin (Switzerland)](https://www.geos.fr/wp-content/uploads/2016/07/RUSSIN-Radier_A-la-une-510x382.jpg)
![Microtunnel Le Corbusier / Ø1500 EC pipeline (Switzerland)](https://www.geos.fr/wp-content/uploads/2016/07/Microtunnelier-Corbusier_12_A-la-une-510x382.jpg)
![CIGEO – Bure (55)](https://www.geos.fr/wp-content/uploads/2016/03/CIGEO.png)
![Line 15 of the “Grand Paris Express” metro system – Villejuif Louis Aragon – Pont de Sèvres section](https://www.geos.fr/wp-content/uploads/2016/03/L15-Puits-de-Boulogne-Terassement-26NGF-Alluvions-Modernes.png)
![Mont Sion tunnel – A41 North motorway – Geneva – Annecy section (74)](https://www.geos.fr/wp-content/uploads/2016/03/Tunnel_Mont-Sion-Autoroute-A41-Nord-Section-Genève-Annecy-74-Création-dun-tunnel-autoroutier-2.png)
![Wastewater disposal tunnel from St Genis Pouilly to Choully (01)](https://www.geos.fr/wp-content/uploads/2016/03/Galerie-de-Choully2.png)
![Kérino under-river crossing at Vannes (56)](https://www.geos.fr/wp-content/uploads/2016/03/Passage-sous-fluvial-Kérino.png)