Rampact® System

25+ ftinstallation depth
3-8 ksftypical bearing capacity
  • Ideal for caving soils
  • Rapid installation (schedule savings)
  • 20-50% savings versus deep foundations and over-excavation
  • No spoils and haul-off costs

The Rampact® pier system is another Geopier stabilization method for soils that simply won’t stay open during drilling.  Rampact piers are a displacement type system that uses a tapered mandrel outfitted with a patented compaction chamber to penetrate through caving soils and construct piers from the bottom up.  This installation method allows for the construction of high-quality Rammed Aggregate Piers (RAPs) below the groundwater table without having to worry about contamination and/or fouling of the aggregate.  The end result of Rampact® is a dense column of aggregate surrounded by stiffened matrix soils that provide excellent settlement control and allow for higher bearing capacities.

Soil Type
  • Caving sands below the groundwater table and soft squeezing clays and silts
  • Debris-laden fill soils – tapered mandrel displaces obstructions

Geopier Rampact® piers are installed by advancing a tapered displacement mandrel through unsuitable soils to a desired design depth. Once at depth, the mandral is withdrawn several feet to allow open-graded aggregate to flow into the annular space.  The mandrel is then redriven to create a densified 2-foot-thick lift of aggregate.  This soil stabilization method is repeated up to the ground surface to create a dense column of aggregate surrounded by stiffened matrix soils.    

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Design Considerations

  • Foundations and slabs can be constructed as conventional spread footings and slabs-on-grade
  • Geopier® systems can be used for uplift and lateral resistance

Construction Considerations

  • Eliminates the need for casing
  • Generates no spoils, eliminating haul-off costs
  • Often results in 20% to 50% cost savings compared to traditional alternatives (removal and replacement and deep foundations) 
  • Rapid installation process means shorter construction schedules