Bretagne-Pays de Loire High-Speed Line, France

Compaction grouting under railway backfills

As part of the construction of the Bretagne – Pays de Loire high-speed line, Menard was requested to stabilise the ground under the railway backfill.

A drilling campaign showed that the area to be treated was made of fossilised karst filled with sand, which made the ground extremely loose and sub-consolidated.

Menard prescribed a solution consisting of compaction grouting. The method was implemented in two phases: the boring and the installation of grouting tubes, then the grouting of mortar over the whole height of the boreholes.

The grouting was carried out following a precise meshing at depths varying between 5 and 15 m.

The Menard group develops foundation solutions based on ground improvement and reinforcement technologies. Its treatments eliminate the need for the deep foundations traditionally used to support surface structures.

Other projects