Kamar | Stone Column Top Feed

Stone Column Top Feed

Kamar Group specializes in Vibro Floatation (Top Feed) Stone Column construction, a globally proven ground improvement technique for loose sands, gravels, and mixed granular soils. Using powerful hydraulic vibro floats, we achieve uniform densification and improved engineering properties for foundations, embankments, and large-scale infrastructure.

Our VF methodology ensures controlled compaction, backfilling, and column development with exceptional accuracy. With extensive experience in metro, industrial, and port projects, we deliver faster execution, reduced settlement, and significantly enhanced load-bearing performance.

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Suitable Soil Types

Non-cohesive to slightly cohesive soils

Sands, gravels, slag deposits

Fully saturated soils below groundwater table

Loose granular layers needing densification

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Performance Advantages

Achieves 80% relative density

Compaction modulus: 80–150 MN/m² (up to 200 MN/m² in ideal soils)

Eliminates differential settlements

Ideal for high structural loads (up to 800 kN/m²)

Homogenizes soil & increases stiffness

Creates 2–4 meter diameter compaction influence zone

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Technical Benefits

Reduces liquefaction risk

Improves shear strength of granular soils

Decreases settlements by 8–15% volume reduction

Suitable for deep compaction (>20–30 m depth)

Water or air flushing used for efficient penetration

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Material Advantages

Backfill: crushed stone, gravel or clean sand

Backfill consumption: 0.4–0.8 tonnes per metre

Uses readily available natural granular materials

Technical Process

Positioning & Penetration: Vibro Float placed at marked point and soil is liquefied using water or air to allow penetration.

Deep Compaction: Once the desired depth is achieved, flushing is reduced and soil densification begins via vibration.

Cavity Formation: A crater forms around the probe due to densification and settlement of loose soil.

Backfilling: Crushed stone/gravel is added from the surface, filling the void created around the probe.

Gradual Withdrawal: Probe is lifted in 0.3 m increments, compacting the backfill in layers until a uniform stone column is formed.

Why Choose Kamar for VF Stone Columns?

20+ hydraulic Vibro Floats (ICE, Pennine, Kamar brand)

Highly trained vibro engineers

On-site monitoring of compaction quality

High-power cranes & power packs

Fast execution for large metro & port projects

Nationwide mobilization capability

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