Services > Ground Improvement > Vibro Compaction
Vibro-Compaction
Vibro-Compaction also knows as VibroFlotation™ is used to densify clean, cohesionless soils. The action of the vibrator, usually accompanied by water jetting, reduces the inter-granular forces between the soil particles, allowing them to move into a denser configuration, typically achieving a relative density of 70 to 85 percent. Compaction is achieved above and below the water table.
The Vibro-Compaction Process

 

 
  • Increases bearing capacity and reduces foundation size
  • Reduces foundation settlement
  • Mitigates liquefaction potential
  • Permits construction on granular fills
Profile of Sand Grains
Important Vibro-Compaction Parameters
  • Ground type and gradation
  • Relative density
Vibro-Compaction Design Steps
  1. Perform site investigation
    Soil gradation important
  2. Calculate predicted settlements
    Problem understood
  3. Establish compaction requirements
    Sufficient densification to reduce settlement and/or prevent liquefaction
  4. Develop appropriate Vibro-Compaction approach
    Treat entire site or just footing?
  5. Establish testing criteria
    Relative density, SPT, CPT, PMT, etc.
Approximate Treatment Requirements for Densification
Expected Vibro-Compaction Results
Vibro-Compaction Quality Control
  • Compaction point locations
  • Resistance level as measured by amp meter (Vibrator draws more current in denser soils.)
  • Quantity of fill added or reduction in site level
Vibro-Compaction Acceptance Testing
  • Standard Penetration Test (SPT)
  • Cone Penetrometer Test (CPT)
  • Pressuremeter Test (PMT)
  • Dilatometer Test (DMT)
  • Load test
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