Abstract
In order to better understand the origin of ageing on driven micropiles in sand, a series of field pull-out tests on small diameter driven piles were carried out in Dunkirk. The micropiles were about 51 mm in diameter, 8 mm wall thickness and 2 m embedment. The micropiles were made of different steel types (mild steel or stainless steel) with different shaft roughness. Sand characteristics, field penetrometer tests and pile tests are summarized. Tension tests were performed at different intervals of time after micropiles installation in attempt to investigate the influence of: (i) physiochemical effects, by testing both stainless and mild steel piles; (ii) the early stages of ageing. A significant increase of capacity was observed in the case of mild steel micropiles, regardless of the shaft roughness, while no ageing effects were observed on stainless steel micropiles. Some micropiles have been pre-loaded in compression at different energy levels. These results suggest the great influence of physiochemical effects (corrosion) for small diameter piles driven in sand. In the case of a prior compressive plastification, the loss of the benefit of ageing is obvious.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Chow, F.C.: Investigations into Displacement Pile Behaviour for Offshore Foundations. Ph.D. Thesis, Department of Soil Mechanics, Imperial College, London, UK (1997)
Daramola, O.: Effect of consolidation age on stiffness of sand. Geotechnique 30(2), 213–216 (1980)
Gavin, K., Igoe, D., Kirwan, L.: The effect of ageing on piles in sand. Spec. Ed. Ice J. Geotech. Eng. Geotech. Chall. Renew. Energy Proj. 166(2), 122–130 (2013)
Jardine, R. J., Standing, J. R., Chow, F. C.: Field research into the effects of time on the shaft capacity of piles driven in sand. In: Proceedings of ISFOG 2005 on Frontiers in Offshore Geotechnics, pp. 705–710 (2005)
Jardine, R., Standing, J., Chow, F.: Some observations of the effects of time on the capacity of piles driven in sand. Geotechnique 56(4), 227–244 (2006)
Jardine, R.J., Standing, J.R.: Field axial cyclic loading experiments on piles driven in sand. Soils Found. 52(4), 723–736 (2012)
Lehane, B. M., Lim, J. K., Carotenuto, P., Nadim, F., Lacasse, S., Jardine, R. J., Van Dijk, B. F. J.: Characteristics of unified databases for driven piles. In: Proceedings of the 8th International Conference on Offshore Site Investigation and Geotechnics, London, UK (2017)
Lehane, B., Jardine, R., Bond, A., Frank, R.: Mechanisms of shaft friction in sand from instrumented pile tests. J. Geotech. Eng. 119(1), 19–35 (1993)
Lim, J.K., Lehane, B.M.: Characterisation of the effects of time on the shaft friction of displacement piles in sand. Geotechnique 64, 476–485 (2014)
Schmertmann, J.: The mechanical aging of soils. J. Geotech. Eng. 117(9), 1288–1330 (1991)
White, D., Zhao, Y.: A model-scale investigation into ‘set-up’ of displacement piles in sand. In: Sixth International Conference on Physical Modelling in Geotechnics, Hong Kong. Taylor & Francis (Eds.) (2006)
Acknowledgements
The authors want to acknowledge the partners of the project, Sol Solution company for their interest in the project, their practical help and fruitful discussions. Many thanks to European partners: Prof. Jardine (Imperial College of London), Dr. Carroll and Dr. Carotenuto (Norwegian Geotechnical Institute), Prof. Gavin (TU Delft), as well as Grand Port Maritime de Dunkerque and Dong Energy for the access to the site. Finally, we want to thank 3SR Laboratory (Geomechanics team) for the financial support.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2018 Springer Nature Switzerland AG
About this paper
Cite this paper
Salama, I., Dano, C., Silva, M., Navarrete, M.B. (2018). Ageing Effect on Pull-Out Capacity of Driven Micropiles in Dunkirk Sand. In: Wu, W., Yu, HS. (eds) Proceedings of China-Europe Conference on Geotechnical Engineering. Springer Series in Geomechanics and Geoengineering. Springer, Cham. https://doi.org/10.1007/978-3-319-97115-5_26
Download citation
DOI: https://doi.org/10.1007/978-3-319-97115-5_26
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-97114-8
Online ISBN: 978-3-319-97115-5
eBook Packages: EngineeringEngineering (R0)