The strength and stiffness of jacked piles in sand

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• Andrew Deeks, CUED
• Friday 20 June 2008, 16:30-17:30
• Engineering Department - **LR4**.

If you have a question about this talk, please contact Zelda Stuck.

The method by which a pile is installed influences the ‘performance’ of the resulting foundation because it affects the strength and stiffness. To develop simple models that can predict the performance of jacked piles a combination of physical testing and theoretical modelling were used.

This presentation will cover three key points:

-Methods to predict the axial strength and stiffness of a jacked pile are outlined.

-A new pile jacking technique in which torque and axial force are applied simultaneously to install tubular displacement piles by rotating them into the ground is described. Methods to predict the axial and torsional installation loads based on failure envelopes and plasticity concepts are presented.

-Fascinating observations emerge in relation to the stress field around a displacement pile when large rotations were applied. The unit shaft resistance was consistently observed to increase during continuous rotation of the pile in the centrifuge model tests. Mechanisms are proposed that link this increase in strength to the observation of increasing pile capacity with time (‘set-up’) in the field.

This talk is part of the Engineering Department Geotechnical Research Seminars series.

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