Pre-excavating pilars is not necessary to carry out dynamic replacement. The initial pounding of the platform is generally sufficient to form the crater that initiates the dynamic replacement pilars. After filling this crater, pounding drives the “compacted plug” into the soil, which then serves as the basis for the formation of the rest of the pilar. [...]
It is possible to use dynamic replacement in organic soils. Dynamic replacement pilars combine to caracteristic features: large diameters (2 to 2.5 metres) and low slenderness ratio. This make dynamic replacement pilars suitable for treating very loose, waterlogged and highly organic soils.