The redevelopment of the Utrecht railway station area is under way. Many new projects are planned especially in the Beurskwartier at the Jaarbeurs side. Right next to the Galaxy Tower at the Croeselaan two 'green' towers are being built for the project Wonderwoods. The project is now only on paper but has already won two awards.

The towers, which are connected by a footbridge, will be 70m and 105m high and will have a ''green character'' with plant and tree species originating from the Utrechtse Heuvelrug. The approx. 360 trees and approx. 10,000 shrubs will be planted on the facade, roof terraces and in various indoor gardens. In total, the number of trees and plants must be comparable to a hectare of forested area. This green area will be sustained by abseiling gardeners.

CRUX is responsible for the total geotechnical package as both advisor and designer: building pit design, foundation advice, settlement analysis, drainage advice and environmental influence.

For us, the focus is on the design and realisation of the underground construction layer (60m by 130m) and the piled foundation of the building. As with the adjacent Galaxy Tower, the underground garage will also be realized here by means of a building pit consisting of anchored CSM-walls and a bottom-seal-lining by means of soil injection.

The towers will load the subsurface through a new piled foundation. The influence of (differential) deformations on the structural design of the building (Van Rossum) and its surroundings was investigated and tested by CRUX by means of Plaxis 3D settlement analyses.

Special attention was also paid to the existing heat and cold storage sources located directly next to the building pit. In the design, various geohydrological and chemical studies were carried out with regard to the groundwater and its quality in order to limit and control the influence of the construction on the existing SKO sources as much as possible. This in consultation with the municipality and the Jaarbeurs.

The construction of Wonderwoods will start in the first quarter of 2020. The towers must be completed in 2023.

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