Dynamic Compaction

Dynamic compaction uses the energy from a falling weight in a pre-determined grid pattern to improve granular soils and fills.
Dynamic compaction is a ground improvement technique that densifies soils and fills materials by using a drop weight. The drop weight, typically steel, is lifted by a crane and repeatedly dropped onto the ground surface.

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The weight and height of pounding depend on the degree of compaction desired, normally up to 25 tons, with height up to 25m.
Vibrations transmitted below the surface improve soils at depth. The drop locations are typically located on a grid pattern, the spacing of which is determined by the subsurface conditions and foundation loading and geometry.
Capable of compacting a wide variety of weak soils
Treated granular soils and fills have increased density, friction angle, and stiffness
Can improve soil conditions on marginal sites to the extent that shallow foundations can be used without deep excavation or piling
Removal of compressible, contaminated fills can sometimes be avoided