Design and Performance of a Piled Raft Foundation

by Mark Randolph, Univ of Western Australia, Nedlands,
Patrick Clancy, Univ of Western Australia, Nedlands,

Document Type: Proceeding Paper

Part of: Vertical and Horizontal Deformations of Foundations and Embankments


The foundation system for a recently constructed building in Perth, Western Australia, consisted of combined pile groups and raft elements, with a total of 280 bored piles incorporated beneath five separate foundation rafts. The soil conditions comprised interbedded medium to dense sands and hard silty clays. Load tests conducted on 12 of the piles showed a wide range in capacity and in stiffness at the nominal working load per pile. The paper discusses analysis of the measured pile performance in relation to deduced modulus values for the soil. The results from a detailed numerical analysis of the foundation system are presented and compared with the measured performance. An alternative pile layout is presented, with a view to minimizing differential settlement of the raft.

Subject Headings: Pile foundations | Pile tests | Bored piles | Soil settlement | Load tests | Foundation design | Soil analysis | Western Australia | Australia

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