A case history illustrating an innovative application of borehole radar tomography to foundation problems in a karstic area is presented. The principles of the method and the geotechnical interpretation of the results are discussed. It is shown that, although ground conditions may be considered as very unfavourable for reflection radar techniques, good results were achieved in the crosshole mode, giving valuable information on both the geometry and the characteristics of the subsurface.

The entrance of the high-speed line in the Brussels South station involves the construction of a specific terminal in the station and of a direct link between the new high-speed line and the new terminal. Therefore more than 3 km of viaducts with single track must be built in an urban environment.A new type of bridge deck has been carried out in order to meet this transportation challenge.

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Concrete (m 3 ): 2065Total cost (EUR millions): 1,85

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