EurOCEAN 2000 - Vlaams Instituut voor de Zee

• A major characterisation programme has been carried out on laboratory prepared and field
cored jet grouting samples. Illustrative results have been presented in this paper.
• The field research into jet grouted pile behaviour has been integrated with a study of pile
ageing in sand and cyclic loading effects.
• The study of ageing effects on driven piles gave results which are broadly compatible with
previous research2,3. The cyclic loading experiments confirm the potential for substantial
cyclic degradation of capacity identified in earlier studies by Imperial College at Dunkirk
and other sites2,3.
• The GOPAL treatment approximately doubled compression capacity of the test pile. The
method appears to have strong potential applications both offshore and onshore.
ACKNOWLEDGEMENTS
The GOPAL programme has been carried out with funding from the European Commission
Marine Science and Technology (MAST) programme under contract number MAS3-CT97-
0119. Additional funding for cyclic loading testing was provided by the UK government
Health and Safety Executive. The test site was graciously made available by the Port
Autonome du Dunkerque. High capacity pile load testing was professionally conducted by
Precision Monitoring and Control of Thirsk, North Yorkshire, UK.
REFERENCES
Brucy, F., Meunier, J. and Nauroy, J.F., “Behaviour of a pile plug in sandy soils during and
after driving”, Proc., 23rd Offshore Technol. Conf., OTC 6514, Houston, Tex., (1991), 145-
154.
Chow, F.C., “Investigation into displacement pile behaviour for offshore foundations”, PhD
thesis, Univ. of London (Imperial College) (1997).
Chow, F. C., R. J. Jardine, F. Brucy and J. F. Nauroy, ”Effects of Time on Capacity of Pipe
Piles in Dense Marine Sand”, Journal of Geotechnical and Geoenvironmental Engineering,
ASCE, (March 1998) 124, No. 3, 254.
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