GCC System

The GeoConcrete™ Column system creates a non-drilling, unreinforced, concrete column. A specially designed, patented mandrel is driven into the ground and the concrete is introduced into the hollow mandrel to improve good to poor soils, including loose sand, soft silt and clay, mixed soil layers, uncontrolled fill, organic silt, peats and soils below the groundwater table.

This method which allows to displace soil during installation and the cretaion of bottom bulb at the column bottom by utilizing vertical impact ramming energy. The vertical ramming action increases the lateral stress and improves the soils surrounding the cavity, which results in foundation settlement control, greater bearing support to meet project requirement or increase the resistance to liquefaction, limit dynamic settlement and improve stability support of embankments, walls and tank pads.


GCC system has become preferred replacements for massive over-excavation and replacement or deep foundations, including driven piles, drilled shafts or augered cast-in-place piles. Local Geopier engineers and representatives work with you and your specific soil conditions and loads to engineer a project-specific practical solution to improve your ground.

Floor Slabs
Industrial Facilities
Storage Tanks
MSE Walls/Embankment Support
Wind Turbines

The Construction Process

The GeoConcreteTM Column system is an efficient and cost-effective solution for the support of settlement sensitive structures. It is an effective replacement for massive over-excavation and replacement or deep foundations, including driven piles, drilled shafts or auger cast-in-place piles or jet-grouting.

1. A specially designed, patented mandrel and tamper foot is driven into the ground using a strong static force augmented by dynamic vertical impact energy. Depths normally range from about 3m to 18m, depending on design requirements. A sacrificial cap or internal compaction mechanism prevents soil from entering the tamper foot and mandrel during driving. The process eliminates spoils and displaces soils laterally, densifying and reinforcing soils.

2. After driving to design depth, the hollow mandrel serves as a conduit for concrete placement. Placed inside, the concrete flows to the bottom of the mandrel. The tamper foot and mandrel are then raised approximately three feet and then driven back down two feet, forming a one-foot thick bottom bulb. Required compaction strokes are developed on-site to provide site specific construction procedures. Compaction is achieved through static down force and dynamic vertical ramming from the hammer. The process densifies concrete vertically and the patented beveled tamper foot forces concrete laterally into cavity sidewalls. This results in excellent coupling with surrounding soils and reliable settlement control with superior strength and stiffness. The top bulb or the intermediate bulb can be installed as well the bottom bulb to meet project requirements.

3. Following bottom bulb installation, GCC elements are installed by extraction the mandrel, support shallow foundations and floor slabs, reduce liquefaction potential, and improve stability support of embankments, walls and tank pads. The footing stresses are attracted to the stiff GCC elements, resulting in engineered settlement control.


The GCC system eliminates casing and allows the construction in soils of high groundwater table.


The GCC system expands column treatment depths to 18m.

Strong and Stiff

The concrete used during the installation results in high rigid GCC elements providing superior support capacity and excellent settlement control.


The GCC system can be used for various soil and groundwater conditions, including deep treatment for liquefaction.


The structures which are currently supported with this system prove high levels of performance and reliability of the GCCs.


A uniform diameter through the column is obtained by the installation technology which prevents the penetration of the concrete into the cavities of the soils with high permeability.


Often results in 20% to 50% savings compared to traditional deep foundation alternatives.


Rapid installation process means shorter schedules.


Projects are engineered by Sentez Insaat Engineers and approved by Geopier Foundation Company.

gcc Geopier GeoConcrete Columns