ABSTRACT
The “Vert de Maison” station belongs to the new Metro Line 15 – in the Municipality of Maison-Alfort in the southern suburbs of Paris. Due to the limited available space in a very dense urban context, the station is composed by an open-cut shaft and an underground cavern driven from the shaft beneath an historical residential building. The underground station has a complex geometry with lateral passages that come down from the shaft and join the main central cavern for an overall total width of about 35 m, an overall height of 20 m and a length of about 70 m. The presence of an operative railway and several historical buildings at the surface obligate the induced settlement field to be the slightest, the selected ground improvements include compensation grouting, ground freezing and mortar injections. The detailed construction design is presented, including construction methods, sequences and 3D FEM analysis for lining design and settlement estimation.
