The ground improvement solution
Menard was contracted to supply and install 1.0 m diameter stone columns using the dry method in 3 of the 5 key sections of the project. More than 200,000 linear meter of stone columns were installed.
The stone column technique has been chosen to improve the soil between 5 and up to 15 m in depth so that the embankment, to support the new railway line, could be built. The height of the embankment can reach 7 m.
The main challenge of this project is that the construction works had to be carried out while the existing railway line was still operational. Thus, Menard had to plan very carefully to ensure that the installation of the stone columns could be carried out safely and without disrupting rail traffic.