Vibratory Ground Improvement Technical Summary Vibrocompaction

VIBRATORY GROUND IMPROVEMENT
TECHNICAL SUMMARY – VIBROCOMPACTION

Layne GeoConstruction is highly experienced in the design and construction of vibro compaction soil improvement techniques with substantial project successes.

Vibrocompaction Installation

Forming compacted zone of soil mass as the vibro compaction progresses. Vibro compaction is a deep compaction technique for densifying sandy soils in place, by means of vibration, in that loose sand particles are rearranged into a more compact state. The improved soil will be capable of higher bearing capacity, and to mitigate subsoils liquefaction potential associated with seismic activities.

Penetration
The Vibroprobe penetrates by vibration and aid of compressed air and water to the required depth. Compaction
The Vibroprobe is retracted from the maxiumum depth in 0.5m intervals. The in situ sand or gravel is flowing towards the Vibroprobe. Backfill
The compaction is achieved either with backfill from the top or with in situ soil only.

		Vibro Compaction - Sand Fill Reclamation
The vibro compaction technique is most suitable for medium to coarse grained sand with fines content (material passing sieve size of 0.074mm) of less than 10%, and clay content of less than 2%. Cohesive soils consisting of silt and clay material will not respond well to the vibratory compaction process. An electrically driven vibrator is utilized for vibro improvement work. The vibrator is suspended by a track mounted crawler crane and lowered by its own weight and vibration with the aid of
jetting water at the bottom nozzles and the wash pipes above the vibrator. The vibrator is lowered to 0.5m above the lower limit of the required compaction depth, at which time the volume of water output at the bottom nozzle jets is reduced and controlled in order to cause compaction of the soil around the vibrator. The wash pipes on the sides of vibrator remain operational to wash the in-situ material on the side of probe hole down as backfill, thereby increasing the relative density of the in-situ sandy soils. The vibrator is raised in 0.5 meter increments, forming a compacted zone of soil mass as the deep compaction progresses.

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