It is a Specialist Deep Foundation Technique used for Ground improvement to considerable depth, up to 75 meters. It uses a probe called Vibro-flot (which could be powered electrically or hydraulically) to strengthen the soil by deep compaction to make the soil suitable to support proposed imposed load.

It involves the introduction of backfill granular material (Sand or Granite) to form Stone columns interlocking with surrounding soil. Treatment is to provide adequate bearing capacity; restrict total and differential settlements to acceptable magnitudes under the proposed loading and provide acceptable long-term performance of the treated ground.

Type of Vibroflotation Method

  • Vibro Compaction method
  • Vibro Replacement method (Wet top feed)
  • Vibro Displacement method (Dry method)



It is the densification of granular soil. Natural deposit as well as artificially reclaimed sand can be compacted to achieve desired bearing capacity and minimal settlement. This is used for purely sandy soil of loose constituent.


This method involved the partial replacement of poor soil material, by flushing out the weak soil with Water/Air Jet and replacing with granular material. This is installation of stone column (made up of granite). This can be used in various soil type that includes Clay (soft, firm, stiff), lateritic Soil, Sandy Clay (of various constituent) and Peaty Soil..


This method is used where the environment plays a critical role in project. It can be either top or bottom feed. Little or no water is used in the construction. The vibro-flot is inserted in to soil and the soil is displaced laterally as the stone column is being formed and compacted.

See pictures of Buildings, Tanks, Batching Plant founded on Vibroflotation Improved Soils.