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Gauteng, South Africa.

Tel: 011 226-8400
Fax: +27 11 494-1604

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Soil improvement

Foundations

AMBATOVY PROJECT
South Africa

Client : Dynatec Corporation Dmsa – Ambatovy Mineral Sa Amsa
Engineer : Snc Lavalin
Contractors : Colas – Dura Soletanche Bachy
Duration Of Works : August 2007 – September 2008
 

Main Quantities

  • 110,000m2 of sandy soils treated using vibroflotation (6m depth max)
  • 6,000 piles, 16.0m deep, 450mm to 750 mm in diameter


Soil improvement and pile foundation for ore processing plant

Ambatovy is a nickel and cobalt ore processing plant project with associated infrastructure. As part of a joint venture, Dura Soletanche Bachy was entrusted with the soil improvement and foundatiosn works for the entire site. The project was located on the east coast of the island of Madagascar, near the port of Toamasina (formerly Tamatave) , in an area of small dunes crossed by the Panglanes Canal.

The first part of the work included the treatment of 110,000m2 of sandy soils by vibroflotation over a maximum depth of 6m. Two cranes were mobilised to carry out this operation.

The second part dealt with the construction of foundation piles. Most were continuous flight auger (CFA) piles. This technique is used to construct piles by screwing a continuous auger sting into the ground. As the auger is extracted, spoil is removed at ground level and concrete is continuously injected through the hollow stem of the auger to the base of the pile. Ground support is maintained during drilling by the soil on the flights of the auger. This method, therefore, ensures fast and cost-effective working. Reinforcement cages were installed to reinforce the first 6 metres of each pile. Some piles, which carry loads generated by cyclone winds, have been reinforced with a Dywidag bar.

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