Dynamic Compaction DC
The Dynamic Compaction technology, also known as dynamic consolidation, is a technology invented and developed by Menard. Since the late 60's, this technique was applied to thousands of sites around the world in very different soil conditions and for very different types of structures: rods, airports, heavy storage, and many other constructions. The technique, after patenting by Louis Menard, was widely examined and optimized, and as a result the application is safe and cost efficient nowadays.
The basic principle behind the Dynamic Compaction (DC) technique consists in the transmission of high energy waves in order to improve weak subsoil. As a result of the impact the soil is compacted depending on its condition, structure and depth. The energy is transferred to the subsoil by multiple impacts with properly shaped weight (steel pounder) with a weight ranging from 10 to 40 tons free falling from a height ranging from 5 to 40 m. In order to perform an effective dynamic consolidation the lattice-boom cranes are used obtaining sufficiently high impact energy. The Dynamic Compaction method consists of two pounding stages where in the first stage deep layers are compacted and in the second stage intermediate layers. After completion of the two stages the surface compaction (so-called 'ironing') is carried out within the entire improved area. The Dynamic Compaction is normally preceded by the development of a test plot where the grid spacing is determined along with the impact energy which is needed to achieve the required compaction, i.e. weight and shape of the pounder and the height of its drop.
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. The Dynamic Compaction is capable to improve many types of soils to high strength parameter values. The depth of the compaction most often varies between 3 and 7 m.