IJburg Project

Project Sheet

Location: IJburg, Amsterdam, The Netherlands

Year: 1995

Project Type(s): Island creation

Project Description: The main purpose of this project was to create artificial island in IJburg that will provide new housing in Amsterdam. The main issue associated with the site was that the subsoil is very soft hence it would be challenging to place the material without removing the soft subsoil or placing a large amount of geotextile on top of the subsoil which could result in high construction costs. Hence, the material to be placed for island creation needed to be placed in thin layers to prevent instability issues in the site. Sand dredged from Lake Markermeer, which was located 25 km (15 mi) from the reclamation site, was placed in thin layers of 50 cm (20 in.) using a computer-controlled spray pontoon for the first three layers and conventional hydraulic placement for the rest of the layers. The spray pontoon was utilized to ensure placement of a constant thickness to avoid load differences and instability. Each layer was allowed to consolidate for 4 weeks to ensure local stability of the subsoil. The total thickness of material placed for island creation is 5.2 m (16.5 ft). Prior to removing the sand from the lake, approximately 9,700,000 cubic meters (12,687,121 cubic yards) of clay, 8 m (26 ft) thick layer, had to be removed by cutter suction and placed back in the lake using the “clay relocation method”.