Recent research into the behaviour of jacked foundation piles

White, D.J. and Deeks, A.D. (2007) Recent research into the behaviour of jacked foundation piles. Kikuchi, Yoshiaki, Otani, Jun, Kimura, Makoto and Morikawa, Yoshiyuki (eds.) In Advances in Deep Foundations: International Workshop on Recent Advances of Deep Foundations (IWDPF07) 1–2 February 2007, Port and Airport Research Institute, Yokosuka, Japan. CRC Press. pp. 3-26 .

Abstract

Pile jacking technology uses static jacking force to install large pre-formed displacement piles without the noise and vibration associated with dynamic piling methods. Recent research into the mechanisms governing the shaft and base resistance of displacement piles is reviewed, and the differences between jacked and driven piles are highlighted. Methods for predicting the resulting pile stiffness and capacity are described, within the framework of recently-developed CPT-based prediction methods. Compared to driven piles, jacked installation leads to enhanced plugging and residual base load, and reduced friction fatigue. The resulting axial response is stiffer and can be stronger than an equivalent driven or bored pile. Recent applications of jacked H-piles to support axial load are reported, and a novel technique for optimising the ratio of axial capacity to installation force via plugging is described.

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