Dynamic compaction is a ground improvement technique that densifies soils and fills by using a drop weight. The drop weight, typically hardened steel plates, is lifted by a crane and repeatedly dropped on the ground surface. 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. Treated granular soils and fills have increased density, friction angle and stiffness. The technique has been used to increase bearing capacity, and decrease settlement and liquefaction potential for planned structures. In shallow karst geologies, it has been used to collapse voids prior to construction, thereby reducing sinkhole potential. Dynamic compaction has also been used to compact landfills prior to construction of a parking lots, roadways, and embankments.
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