The influence of effective area ratio on shaft friction of displacement piles in sand

White, D.J., Schneider, J.A. and Lehane, B.M. (2005) The influence of effective area ratio on shaft friction of displacement piles in sand. Gourvenec, Susan (ed.) In First International Symposium on Frontiers in Offshore Geotechnics. Taylor & Francis. pp. 741-747 .

Record type: Conference or Workshop Item (Paper)

Abstract

As a cone penetration test (CPT) induces similar strain paths to closed ended pile installation, its results are directly applicable to the evaluation of radial stress on closed ended piles. For CPT data to be used to evaluate the shaft capacity of open-ended piles, an understanding of the relative magnitude of radial stress on open and closed-ended piles is necessary. This relative magnitude is explored using cavity expansion theory to simulate the stress field as soil flows around a pile tip. The end condition of the pile affects the flow field. These analyses allow the difference in shaft friction on open and closed-ended piles in sand to be linked to the pile area ratio and plugging behaviour, with friction angle having a small influence. A function of the effective area ratio, which combines the area ratio of the pile and the incremental filling ratio, is proposed for estimating the difference in radial stress along open-ended piles as compared to closed-ended piles.

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