A modified CPT based installation torque prediction for large screw piles in sand.
2018
Screw piles have been suggested as an alternative foundation solution to straight-shafted
piles for jacket supported offshore wind turbines in deep water. The significant environmental loads in the
marine environment will require substantially larger screw piles than those currently employed in onshore
applications. This raises questions over the suitability of current design methods for capacity and installation
torque. This paper aims to address this issue by presenting a screw pile installation torque prediction
method based on cone resistance values from Cone Penetration Test (CPT) data. The proposed method,
developed using centrifuge modelling techniques in dry sand, provides accurate predictions of installation
torque for both centrifuge and field scale screw piles. Furthermore, unlike existing CPT-torque correlations,
the proposed method is shown to be applicable to multi-helix screw piles.
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