TECHNICAL OVERVIEW
Section T3C of Line 15 South, where an 8-km tunnel will be built and civil engineering tasks (five new stations and eight shafts) and special works (filling in a quarry) will be carried out, is an outsized project that requires major logistical resources. On this project, two earth-pressure balance TBMs (with a diameter of nearly 10 m) will have to operate concurrently at 30 to 40 m in depth in varying geological conditions quite near the water table. In the civil engineering mandate, five new stations and eight shafts will be built, including shafts with diameters ranging from 7 to 11 m reaching depths of 40 to 50 m. Villejuif Gustave-Roussy station, which is emblematic of this section due to its architecture and size (65 m in diameter 42 m deep), will link Lines 15 South and 14 South.
In addition, special works are required. This portion of Line 15 running under many quarries must be prepared for tunnel-boring. Preparatory works will last from several weeks to several months.
Lot GC02 for Line 14 South involves building a 4.6-km tunnel between the future station at Maison Blanche Paris XIII and the TBM entry shaft at Jean Prouvé, which will be bored using an earth-pressure balance TBM. This lot also includes construction of a new station at Kremlin Bicêtre Hôpital and five ventilation and one emergency-rescue shaft and filling in 14 quarry sites. This large-scale project conducted in busy urban settings will be carried out across the following communes: Paris, Kremlin Bicêtre, Gentilly, Villejuif, and L’Haÿ-les-Roses.
The use of “alternative” conveyance modes such as river and rail transport will be used in part to remove excavation materials.
