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Rammed Aggregate Piers

Rammed Aggregate Piers are a ground improvement system that uses compacted aggregate to create stiff pier elements. The installation process modifies the soil surrounding the piers. Piers are installed by drilling 24-inch to 36-inch diameter holes into the foundation soils and ramming thin lifts of well-graded aggregate within the holes to form stiff, high-density aggregate piers. The drilled holes typically extend from 7 to 30 feet below grade. The first lift is often open-graded aggregate and forms a bulb below the bottom of the pier and acts as a stabilized layer for compaction of subsequent lifts which are typically 12 inches in thickness. Natural and recycled aggregates have been used (e.g., aggregate from crushed Portland cement concrete). A high-energy beveled tamper mounted on excavator equipment is used to compact the aggregate. The ramming action both compacts the aggregate and forces the aggregate laterally into the sidewalls of the hole. This action increases the lateral stress in the surrounding soil, further stiffening the stabilized composite soil mass. As a result of the lateral pre-stressing, the matrix soils surrounding the piers are partially densified.

Rammed Aggregate Piers Images

Rammed Aggregate Piers
Rammed Aggregate Piers
Underground view
Underground view

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