This Palm is intended to house residential and tourist complexes, shopping and leisure centres, for a population of approximately 250,000 people. The Vibroflotation Group Ltd, a former Soletanche Bachy subsidiary, as part of a joint venture with APCC, was awarded the design and build contract for ground improvement works.

The site covers 10km² of land to be treated, spread over a total area measuring 50km², where most access to the worksites is by sea.

This non-standard site mobilized more than 400 people with up to 20 cranes and a series of 36 compaction units (V48 for compacting and V23 for the stone columns).

After backfilling an area contained by rock armour to a thickness of approximately 15m, vibroflotation treatment could commence. This technique, sometimes called vibrocompaction, is used to increase load-bearing capacity, homogenise soil conditions, limit subsidence and differential settlement and eliminate the risk of liquefaction in granular soils.

Once this treatment was completed, 60 load-bearing tests, 1,000 test bores and 40,000 CPT (Cone Penetration Tests) were carried out.

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The Ressources

• 16 cranes in service
• 24 x 500KVA to 1,250KVA generating sets
• 38 compressors
• 50 compaction units
• 18 mechanical loaders
• 2 unloading lighters
• 5 fast transport vessels

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Our records

• 22 nationalities present on the project and 10 working languages,
• 34,000 m² of land worked per day,
• 445,000 m³ of land treated per day,
• 1,120 dynamic cone penetrometer measurements carried out and analysed each week.