Dynamic compaction uses the energy from a falling weight to improve granular soils and fills. Dynamic Replacement uses the energy of the falling weight to drive large diameter granular columns into cohesionless soils and fills. Keller has successfully provided numerous dynamic compaction and replacement projects over the last 15 years.

Common Uses

  • Increase bearing capacity
  • Decrease settlement
  • Mitigate liquefaction
  • Reduce sinkhole potential

Technical Details

Dynamic compaction is a ground improvement technique that densifies soils and fill materials by using a drop weight. The drop weight, typically steel, is lifted by a crane and repeatedly dropped onto 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. In shallow karst geologies, it has been used to collapse voids prior to construction to reduce sinkhole potential. Dynamic compaction has also been used to compact landfills prior to construction of parking lots, roadways, and embankments.