Dynamic Compaction (DC)

Menard - Soletanche Freyssinet

Dynamic Compaction (DC) is a method of ground improvement invented and developed by Menard more than 50 years ago, for the treatment of loose granular soils and fills, using steel weights (pounders).

Why is it used?

To improve the bearing capacity and settlement characteristics of non-cohesive soils, for the foundations of buildings but also in civil applications and embankments. DC is a cost effective method for sand densification / soil compaction / landfill treatment / unconsolidated fill or soil treatment.

How does it work?

It consists in repeated high energy impacts by a high mass pounder dropped from a large crane to transfer energy into the ground, causing compaction and densification of the ground.

Impact points are set out in a grid pattern for the area to be treated. No additional materials are required beyond backfill for the craters created in the platform surface.


The depth of effective densification is a function of the energy imparted per impact and depths in excess of 16 metres can be compacted. The overall design of the treatment is determined by the total energy imparted per square metre of site area.


Dynamic Compaction is applicable to any kind of non-cohesive soils even in the presence of rocky fraction. This technology is particularly effective with non-organic, heterogeneous fills and in reclaimed areas with different characteristics (in particular, for abandoned landfills, open-pit mines and quarries, uncompacted dumps).

The method is used for improvement of the subsoil under industrial and commercial halls, heavy warehouses, tanks, aprons, road and rail embankments and other large or linear structures.

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