SYSTRA is responsible for detailed design of the underground infrastructure for the northern and southern extensions of Line 14.
The northern extension has 3.5 miles of tunnel and four stations and will reduce the overcrowding on Line 13 at its northern side. For two of stations–Porte de Clichy and Mairie de Saint-Ouen, geothermal energy integration was used to reduce energy consumption and GHG emission. Because of challenging ground conditions and groundwater, the team continued implementation of ground freezing for the excavation of the station at Porte de Clichy and Clichy-Saint-Ouen.
The southern extension includes 13 miles of tunnel and seven stations and will connect Olympiades, the current terminus of Line 14, to the Paris Orly International Airport. During construction the TBM crossed the airport’s taxiway and the new passenger interchange station.