What Is a Rammed Aggregate Pier Foundation System?
Rammed aggregate piers (the Geopier — the aggregate compacted in the lifts — the stiff columns) reinforce the soft soils — the piers' stiffness attracting the load, the matrix's densified. The system: the piers (the 24-36 inch — the rammed; the modulus), the footing (the supported — the bearing's increased; the settlement's reduced), and the verification (the modulus — the tests). The ground improvement's — the intermediate foundation.
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How piers work
The ramming (the aggregate — the lifts'; the compaction — the lateral's stress; the bulb's), the composite (the stiff piers — the soft matrix; the stress's concentration), and the footing (the conventional — the improved ground's; the bearing's — the 6,000+ psf).
Design
The modulus (the composite — the tests'; the settlement's), the spacing (the grid — the area's; the ratio), the bearing (the increased — the allowable; the factor of safety), and the liquefaction (the densification — the mitigation's; the drainage). The Geopier's — the proprietary; the design-build.
Applications and QC
The soft clays (the settlement's — the control), the fills (the uncontrolled — the improvement), the footings (the shallow's — the enabled), and the QC (the modulus tests — the verification; the installation's — the monitoring). The piers are the middle — the deep's cost avoided, the shallow's enabled.
The bottom line
Rammed aggregate piers (Geopier-type) densify soft soils into composite ground supporting conventional footings at 6,000+ psf — verify with modulus load tests.
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