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ON THE SHAFT FRICTION MODELLING OF NON-DISPLACEMENT
PILES IN SAND
V. Fioravante
ABSTRACT: To evaluate the capability of a centrifuge physical
model to catch the main aspects of the shaft friction mobilisation of
non displacement piles in sand, a series of centrifuge tests was carried out by axially loading an instrumented model pile embedded
without displacement, in homogeneous dry sand. Three model piles with
different roughness were combined with two silica sands (Toyoura
and FF) with different grain size. After a description of the
experimental set-up, test results were analysed with reference to the
current practice (b method). Moreover, the effects of the normalised
pile skin roughness, Rn, on the shear stress mobilised have been
investigated. Finally, the shaft friction mechanisms observed from
centrifuge tests, were interpreted by direct shear tests on sand/rigid
plate interface under constant normal stiffness.
Key words: centrifuge model test, pile, lateral resistance of
pile, size effect/scale effect, direct shear test, special shear test,
deep foundation (IGC: E4/E12/E14)
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