X1® System

40+ ftinstallation depth
5-10 ksftypical bearing capacity
  • Ideal for non-caving soils
  • Rapid installation (schedule savings)
  • 20-50% savings versus deep foundations and over-excavation
  • Minimal spoils and haul-off costs

The Geopier X1® system is our newest “drill and fill” solution. This system is ideal for non-caving soils that stay open during drilling but can also be used as a ground displacement system in clean sands.  Geopier X1 piers are constructed using a track-mounted auger to drill out unsuitable soils and a specialty mandrel mounted to a mast rig to construct the Rammed Aggregate Pier®  (RAP) elements. The specialty mandrel and larger equipment allows for significantly faster and cheaper pier construction. The end result is a dense column of aggregate surrounded by stiffened matrix soils that provide excellent settlement control and allow for higher bearing capacities.

Soil Type
  • Non-caving soils such as clays, silts, and sands with high fines content
  • Clean sand profiles
  • Organic soils using cemented treated aggregate (CTA)

The Geopier X1®  installation process consists of drilling out unsuitable soils to a desired design depth and then constructing a dense column of aggregate using a patented tamper.  The pier is constructed in 3-foot-thick lifts using well-graded aggregate, open-graded aggregate, or sand.  The installation process imparts significant lateral pressures into the adjacent matrix soil, which creates excellent coupling and stiffens the soil.

Download Specifications

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Design Considerations

  • Cement-treated aggregate can be used for sites with organic soils, heavy loads, or adjacent structures that are settlement sensitive
  • 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

  • Generates minimal spoils compared to removal and replacement
  • 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