Terra Et Aqua

Number 89 - December 2002

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Articles

Dredging Stiff to Very Stiff Clay in the Wielingen Using the DRACULA® System on a Hopper Dredger

STEFAAN VANDYCKE

Dredging stiff clay is notoriously difficult. A newly patented system using high pressure waterjets in the hopper dredger's draghead has solved several operational problems. For his description of this innovative technique, the author was presented with a 2002 IADC Award at the PIANC Conference in Sydney, Australia.

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Reclamation on Soft Subsoil by Spraying Thin Layers of Sand: The "IJburg" Project near Amsterdam

H.A. DE LEEUW, F.A.J.M. MATHIJSSEN, A.L.PH. ESTORGIE

The question is: How do you create a stable platform when reclaiming sand on a very soft subsoil? Removing the subsoil or placing large amounts of geo-textiles are costly. The answer is: A new method using a custom-built spray pontoon which has proven efficient and economically viable.

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cover

For the creation of new land for the city of Amsterdam known as the “IJburg” project, an innovative system of reclaiming sand on soft subsoil as well as a “clay relocation method” were developed.

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