984
Proceedings of the 18
th
International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
6 CONCLUSIONS
The paper has presented and discussed the details of developing
and testing a novel model pile loaded in the centrifuge using a
novel pile loading setup. The new pile, which adopted a semi-
circular cross-section and was sleeved along its shaft to
minimise friction, enabled a test load from the loading setup to
be predominantly transmitted axially along the pile with
minimal bending effects, which have been traditionally difficult
to deal with. Within the working load range, the variation
between the change in head and base loads was found to be very
small. The vertical displacement PIV data at the pile toe shows
the importance of the modelling details in obtaining high quality
data.
7 ACKNOWLEDGEMENTS
Figure 5. Pile C load cell response – comparison of novel load cells with
commercially available Novatech head load cells.
The authors would like to thank the EPSRC and Ove Arup and
Partners for their support and funding for this project as well as
the technical staff at Cambridge University Engineering
Department for the construction of the items described in this
paper.
8 REFERENCES
5.2
Load Settlement Response
The PIV response of the pile toe and the surrounding soil is
shown in Figure 6 for the load relating to 10% of the pile
diameter or 520 N (2.8 MPa). The data around the pile toe is of
exceptional quality, and it is possible to see the rigid cone
beneath the pile toe with the emanating strain bulb centred
beneath the pile toe.
Schofield A. 1980. Cambridge geotechnical centrifuge operations.
Géotechnique
30 (3), 227-268.
White D.J., Take W.A. and Bolton M.D. 2003. Soil deformation
measurement using particle image velocimetry (PIV) and
photogrammetry.
Géotechnique
53 (7), 619-631.
Marshall A.M. 2009. Tunnelling in sands and its effects on pipes and
piles.
PhD Thesis.
University of Cambridge.
Lu W. 2010. Axisymmetric centrifuge modelling of deep penetration in
sand.
PhD Thesis.
University of Nottingham.
White D.J. and Bolton M.D. Displacement and strain paths during
plane-strain model pile installation in sand.
Géotechnique
54 (6),
375-397.
Lehane, B.M., Gaudin, C. and Schneider, J.A. 2005. Scale effects on
tension capacity for rough piles buried in dense sand.
Géotechnique
55 (10), 709-719.
Williamson M.G. 2013. The effects of tunnelling on bored piles.
PhD
Thesis.
University of Cambridge.
Figure 6. Vertical displacement contours (mm) at a pile displacement of
10% D
Pile
.
