DYNAMIC REPLACEMENT (DR)
Using a heavy steel pounder with a special shape, that is repeatedly dropped in the ground, craters are formed, which are later filled with granular material, which is compacted using the same pounder.
The dynamic action produced by the impact of the pounder with the ground, inserting granular soil in it, and pushing it laterally during compaction produces a reacomodation of the ground particles
that densifies the ground. Aditionally, the granular columns of great diameter (1.8 to 2.2 meters), also represent significant drainage zones that allow a quick dissipation of pore pressures that increase suddenly during earthquakes.