Dynamic replacement

Dynamic replacement is a variation on dynamic compaction and uses the energy of a falling weight to drive large diameter granular columns into cohesionless soils and fills.

Process

Selected material is driven in to partially or completely displace the in-situ material to form columns of compacted material. A surface blanketing layer consisting of compacted selected material then transfers the load to these compacted columns. 

Common uses

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

Advantages

  • Capable of compacting a wide variety of weak soils
  • Increased bearing capacity
  • Reduced settlement
  • Treated granular soils and fills have increased density, friction angle, and stiffness.
  • Can improve soil conditions on marginal sites to extent that shallow foundations can be used without deep excavation or piling
  • Removal of compressible, contaminated fills can sometimes be avoided

Related techniques

Ground improvement

Related resources

Dynamic Compaction (DC)
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Related techniques

Ground improvement

Related resources

Dynamic Compaction (DC)

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