DRIVEN PILE FOUNDATIONS OF EXCEPTIONAL LENGTH FOR THE WOMEY VIADUCT AT COTONOU, IN BENIN

摘要

Construction of the Womey viaduct in Benin is taking place in the very heterogeneous geotechnical context of the Djonou lagoon at Abomey Calavi. Due to successive collapses of the temporary access embankment for construction of the structure, the viaduct design and construction method had to be adapted to the area's peculiar geological and geotechnical context: a jetty bridge constructed using a pile-driving-guide launcher. Next, to overcome the residual geotechnical uncertainties which could not be resolved by additional geotechnical surveys, stringent pile driving monitoring was implemented to guarantee the load-bearing capacity of the foundations.