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  Mutual influence of foundation elements and anchor pile design of a top down diaphragm wall tunnel

  In the Delft railway Tunnel project, the interaction between the applied foundation elements played an important role. Diaphragm walls were installed at close proximity to existing piled foundations of a railway viaduct and grout anchor piles were realized in between prior installed diaphragm or sheet pile walls. A large amount of cone penetration tests were performed to investigate the mutual influence of the installation of these foundation elements upon each other. The applied pile test methods were optimized during the execution process in order to eliminate the shaft bearing capacity of the upper cohesive layers. As rather slender piles were used, buckling stability was verified by calculation and by testing as well. Finally, the impact of a future big variation in the existing dewatering upon the bearing capacity of the piles will be explained.

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