Authors: de Leeuw, H.A.; Smits, E.P.T.; Mathijssen, F.A.J.M.; Estourgie, A.L.Ph.
Reference: de Leeuw, H.A.; Smits, E.P.T.; Mathijssen, F.A.J.M.; Estourgie, A.L.Ph. 2002. Reclamation on Soft Subsoil by Spraying Thin Layers of Sand: The “Ijburg” Project near Amsterdam. Terra et Aqua. 89. December 2002
Summary: A stable platform was created on soft subsoil using thin-layer placement of sand. This was accomplished using a custom built spray pontoon. A consolidation period of four weeks was allowed between each layer of sand (50 cm layers). Run off suspended solids were minimized to 400 mg/L using large settlement basins and high flow water pumps. The soft subsoil was a young Halocene clay layer over a Halocene peat and clay-layer (total thickness ranging from 6-12 meters). Vertical drains allowed consolidation periods to be 10 times faster. The geotechnical success of the placement project relied on accurately placing the first thin-layer of sand.
What You Will Find Here: Introduction p. 9, Main Features of the Project and its Design p. 12, Geotechnical Aspects p. 17, Sand Extraction and Overburden Removal by “Clay Relocation” Method p. 26, Spraying Sand p. 28, Reducing Dredging Delays p. 30