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Vibro Compaction


The objective in Vibro Compaction is to achieve densification of coarse grained soils with less than 10-15% silt. The effect of the process is based on the fact that particles of non-cohesive soil can be rearranged by means of vibration.

Effect of vibro compaction on soil density

The angle of friction is increased resulting in much higher shear resistance. The modulus of deformation is also increased, resulting in reduced settlements.

The Vibro Compaction process may be described as follows:

1. Penetration
The water jets are fully opened to allow speedy penetration to design depth. The vibrator penetrates the ground under its own self weight.

2. Compaction & Backfilling
Upon reaching design depth, the vibrator is held at that level to compact the soil. The vibrator is then lifted a specified distance and held at that position. This is carried out until the required zone of soil is treated. As the vibrator is being lifted stepwise, sand is filled into the developing crater.

Summary: Vibro Compaction

Applicable soil(s)

  • Coarse grained soils with silt/clay content less than 10-15%

Principle

  • Densification by vibration

Effect(s)

  • Increased shear strength
  • Increased stiffness
  • Reduced liquefaction potential

Common applications

  • Buildings
  • Chemical plants
  • Storage tanks & silos
  • Pipelines
  • Wharf structures
  • Embankments
  • Roads

Maximum depth

  • 60 m

Land / offshore application

  • Both

   
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