Geopier Densipact®

The Geopier Densipact system is an innovative soil  improvement method created through research by Geopier Foundation Company.  Its singular purpose is to densify loose sandy soils to depths of 25 to 30 feet.  The Densipact system creates Rammed Compaction® points by repeatedly driving a multi-tined tool into loose sands using both high-frequency,  vertical impact energy and downward crowd force.  The cavities are filled with granular fill.  The process significantly increases the density of loose sand and gravel to reduce settlements and increase bearing capacity for structural support.

The Densipact Construction Process

  1. A specially designed, multi-tined tool in inserted into the ground with high-frequency vertical impact energy and downward crowd force to the design depth.
  2. The tines are removed and the resulting cavities and depression are filled with sand or other suitable aggregates.
  3. The tooling is then re-driven in the same location to further improve the loose sand and the backfill.  The process is repeated (typically two to three times per location) until increased penetration resistance is achieved.  The improvement is verified by load testing or in-situ penetration testing (CPTs, DPTs, etc.).

Construction Advantages

  • Cost-effective
  • Clean (dry process) and rapid with no spoils
  • Eliminates casing and allows for construction in caving soils below the ground water
  • Accelerates construction schedules
  • Proof tested with standard geotechnical techniques
  • Low vibration levels compared to driven piles
  • Reliable and cost effective

Design/Performance Advantages

  • Excellent settlement control
  • Superior support capacity
  • Increased bearing pressure up to 14,000 psf
  • Designed for structural support of buildings
  • Engineered to meet specific soil conditions and loads



 Densipact used for support of 12-story apartment tower in St. Louis Park, MN


  • Foundations
  • Floor Slabs
  • Industrial Facilities
  • Storage Tanks
  • Wind Turbines
  • Transportation
  • MSE Walls
  • Embankments
  • Railroad
  • Liquefaction/Seismic