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Consolidation

 

Peaty, clayey and sometimes even silty soils are characterized by a high-water content, very low permeability and a low strength. When loads are applied to these soils, excess pore water pressure develops as the soil cannot adjust to the new load due to the very low permeability and slow dissipation of the excess pore water. With the dissipation of the excess pore pressures the soil adjusts to the new load. This often results in long periods (years) with high consolidation settlements and a low to insufficient safety factor on the stability of the embankment. With the application of low cost prefabricated vertical drains (PVD) a considerable reduction of the consolidation / settlement time, from years to months, and a major improvement in the stability of the embankment can be achieved. When surcharge is used, residual settlements can be controlled. The use of PVD with surcharge is therefore one of the most commonly used techniques and often the cheapest method to prepare soft compressible subsoil for future construction activities. Cofra has several consolidation systems within its portfolio. Find out more by using the links in the overview below. 

Website Diagram Consolidation Wide
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Our solutions

Cofra has the following consolidation solutions within it's portfolio

Offshore vertical drain installation

A selection of our consolidation projects

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PVD installation airport construction Changi East, Singapore

We have installed, 42,000,000m1 of prefabricated vertical drains, with an installation depth up to 60m.

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PVD installation Matarbari USCC Power Plant Project, Bangladesh

In 2018 and 2019, we installed over 10,000,000m1 of prefabricated vertical drains, with an installation depth up to 25m.

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PVD installation for reclamation Centerpoint Makassar

In 2017, we installed 7,000,000m1 of prefabricated vertical drains, with an installation depth up to 25m.

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PVD installation new Mexico City airport runway 3

In 2017, we installed 27,800,000m1 of prefabricated vertical drains, with an installation depth up to 20m.

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Offshore PVD installation M02 basin enclosure Port de Brest, France

In 2018, we installed 415,000m1 of prefabricated vertical drains from a barge, with an installation depth up to 17 below seabed. 

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PVD installation N23 provincial road widening the Netherlands

Between 2015-2016, we installed 11,300,000m1 of prefabricated vertical drains, with an installation depth up to 12m.