Dynamic Replacement is an economical method for improving the overall stiffness of clay, silt and organic soils. Dynamic Replacement uses granular backfill to form large-diameter granular columns with high shear strength and increased bearing ability through soft soils, fills or waste materials.  These columns remain stable under low confining pressures.

Dynamic replacement | MENARD

Key Elements


Large diameter columns formed by driving granular material into the soft ground  by dropping a 15- to 30-ton weight from 30 to 120 feet.  The material used to fill the columns can be pushed from the working platform or directly from a loader into the crater.


By creating a composite material consisting of the dynamic replacement column and the surrounding ground, the strength and geotechnical properties of the soil mass are improved.


Increases bearing capacity, reduces long-term settlement and consolidation time of compressible soft fine-grained soils.

CMC techniques for soil

Dynamic Replacement columns are driven into the soil with a 15-to-30-ton pounder dropped from a height of 30 to 120 feet. The column is filled and compacted in alternating phases until it is completed.

Advantages of Dynamic Replacement

  • Uses a similar methodology as Dynamic Compaction allowing the techniques to be easily combined at sites with variable ground conditions
  • Economical, particularly for large-footprint sites
  • Eliminates removal and replacement or traditional foundations such as piling
  • Very low carbon footprint as compared to other forms of ground improvement or traditional foundations
  • Does not generate spoil

Featured Dynamic Replacement Projects