Abstract
Design of raft foundations on medium to dense sand is usually dictated by the allowable settlement rather than by a requirement to achieve an adequate margin against bearing failure. Piles are often installed under rafts to improve settlement performance, primarily the differential settlement, thereby to enhance structural performance. A practical design method has been developed for piled-raft foundations as a part of the Kinaxixi multi-use complex project in Angola; this is aimed at achieving an optimum pile configuration and is described in this paper. This method involves an iterative procedure to achieve consistency, with the design models representing the geotechnical and structural behaviours. The actual settlement of the raft is compared with the predictions as a means of validating the design method.
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