The railway between Utrecht and Geldermalsen crosses the deepened highway A27 by means of a viaduct. The actual car overpass which runs parallel to this viaduct has to be retro-fitted for railway traffic. A new overpass for car traffic is therefore necessary. It is chosen to set this overpass on two land abutments and a centre pillar. The particularity of this location is that at Amelisweerd, the deepened A27 is laid out in a polder construction sealed off with a deep foil. After verification appeared that the expected sand layer that should have been above the foil was largely missing. The soil profile consists namely of clay and loose packed sand layers, which would make a traditional shallow foundation unsuitable. A ground improvement technique that could make this type of foundation possible was sought after. The implementation of jet grouting appeared to be the optimal solution.
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