Vibro-Compaction (VC)

Vibro-compaction (VC) is a wide used ground improvement technique in the geotechnical industry, that is used to densify the granular soils and improve the geo-mechanical parameters. The basic principle for vibro compaction (VC) is to rearrange the soil particles through vibration process and compact the soil into
denser state.

This soil improvement technique is suitable on coarse grained soils (non- cohesive soils) with very minimal silts/clays content.

Vibro-compaction (VC) works are done using a vibrator with specific frequency suspended from a crane to penetrate to the improvement design depth. Water jetting is often used to aid penetration. The energy of the vibrations reduces the forces acting between the soil particles which allows them to become denser.

Upon reaching the required depth, water pressure is cut-off and the vibrator is held for certain time in this position and pulled back in short distances. The soil particles around the vibrator are rearranged into a compacted denser state. Due to increase in density, a crater forms around the vibrator. This depression around the vibrator is backfilled with either available surface sand or imported sand.

After vibro compaction, soil subsidence in the range of 5 to 10% of the treated depth occurs due the densification of soil. Upon completion of vibro- compaction, the surface is roughly levelled and if required, compacted with a surface vibratory roller compactor or RIC or HEIC.

This ground improvement technique is typically applicable on sandy soils for structures, embankments, dams, reclaimed areas and artificial islands.