ABSTRACT
The Vert-de-Maisons station is part of the future Line 15 South of the Grand Paris Express in the Paris area, France. It includes a 17 m span underground cavern and is being constructed in a highly urbanized area and in a very difficult hydrogeological context.
Due to limited space available on the surface, the station is designed and constructed in two parts: the main open-air station built using diaphragm walls, and the underground structure excavated using conventional method, named hereafter the cavern.
Several ground treatment techniques are required to construct the station (penetration grouting, Artificial Ground Freezing). Compensation grouting is also implemented to limit the amplitude of surface displacements (historic buildings and railway tracks in use).
This article details the sequence, and the ground improvement methods, particularly the Artificial Ground Freezing (AGF), implemented for the cavern construction.
