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Stone Column Bottom Feed

Kamar Group is a leading specialist in Vibro Displacement (VD) / Bottom Feed Stone Column technology, suitable for soils with higher fines content such as silts and clays. In these soils, natural particle rearrangement is not possible; therefore, our bottom-feed vibro system creates a cavity and builds the stone column from the bottom upward using pressurized stone feeding.

Our VD systems are engineered to improve shear strength, stiffness, and drainage characteristics of weak strata. This method allows construction of load-bearing stone columns that increase the soil’s composite strength by 2 to 3 times, making it ideal for industrial foundations, metro rail structures, embankments, and heavy load zones.

Features

Ideal for cohesive & mixed soils (high fines content)
Stone fed through the bottom for maximum compaction
Increases soil stiffness by 2–3 times
Faster dissipation of pore pressure
Prevents liquefaction in seismic zones
Column diameter: 0.6 m to 0.9 m
Backfill material consumption: 0.6–1.0 tonnes per linear metre
Suitable for deep improvement (>20–30 m)
Uniform load transfer to foundations

Applications

Metro stations & depot foundations
Industrial buildings
Storage yards & tank pads
Road embankments
Port platforms
Solar & wind project foundations
Land reclamation

Technical Process

Vibro probe lowered using crane & air flushing system
Soil displaced to create an annular cavity
Stone fed through the bottom feed pipe
Compacted in 0.3–0.5 m lifts
Column formed until required diameter & pressure achieved