Imperial College London

ProfessorRichardJardine

Faculty of EngineeringDepartment of Civil and Environmental Engineering

Consul for the Faculty of Engineering & the Business School
 
 
 
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Contact

 

+44 (0)20 7594 6083r.jardine CV

 
 
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Assistant

 

Ms Sue Feller +44 (0)20 7594 6077

 
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Location

 

532Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Buckley,
author = {Buckley, R and Jardine, R and Kontoe, S and Barbosa, P and Schroeder, F},
journal = {Géotechnique},
title = {Full-scale observations of dynamic and static axial responses of offshore piles driven in chalk and tills},
url = {http://hdl.handle.net/10044/1/71677},
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - This paper describes and interprets tests on piles driven through glacial tills and chalk at a Baltic Sea windfarm, covering an advance trial campaign and later production piling. The trials involved six instrumented 1.37m diameter steel open-ended tubes driven in water depths up to 42m. Three piles were tested statically, with dynamic re-strike tests on paired piles, at 12-15 week ages. Instrumented dynamic driving and re-strike monitoring followed on up to 3.7m diameter production piles. During driving, the shaft resistances developed at fixed depths below sea-bed fell markedly during driving, with particularly sharp reductions occurring in the chalk. Shaft resistances increased markedly after driving and good agreement was seen between long-term capacities interpreted from parallel static and dynamic tests. Analyses employing the sites’ geotechnical profiles show long-term shaft resistances in the chalk that far exceed those indicated by current design recommendations, while newly proposed procedures offer good predictions. The shaft capacities mobilised in the low-plasticity tills also grew significantly over time, within the broad ranges reported for sandy soils. The value of offshore field testing in improving project outcomes and design rules is demonstrated; the approach described may be applied to other difficult seabed conditions.
AU - Buckley,R
AU - Jardine,R
AU - Kontoe,S
AU - Barbosa,P
AU - Schroeder,F
SN - 0016-8505
TI - Full-scale observations of dynamic and static axial responses of offshore piles driven in chalk and tills
T2 - Géotechnique
UR - http://hdl.handle.net/10044/1/71677
ER -