A new approach to estimate shaft capacity of bored piles in sandy soils, based on numerical analysis, is presented. The topic is relevant as current design methods often largely underestimate the shaft capacity of piles in sands, thus resulting in an over-conservative design. The proposed approach is based on explicitly modelling the thin cylinder of soil surrounding the pile, where strain localization concentrates (shear band), and on the fundamental mechanic behaviour of sandy soils (e.g. dilatancy, softening). This approach is both simple and easy to apply. Results of a broad parametric study involving axially loaded single piles embedded in different sandy soils are presented, highlighting that relative density and grain size distribution mainly affect the shaft capacity. The capability of the procedure to predict shaft friction is checked against data from a well-documented full-scale axial load test on instrumented pile. Some suggestions for calibration and application of the method are also reported. © 2014 Springer-Verlag Berlin Heidelberg.

A numerical approach to estimate shaft friction of bored piles in sands / Ylenia, Mascarucci; Miliziano, Salvatore; Alessandro, Mandolini. - In: ACTA GEOTECHNICA. - ISSN 1861-1125. - STAMPA. - 9:3(2014), pp. 547-560. [10.1007/s11440-014-0305-4]

A numerical approach to estimate shaft friction of bored piles in sands

MILIZIANO, Salvatore;
2014

Abstract

A new approach to estimate shaft capacity of bored piles in sandy soils, based on numerical analysis, is presented. The topic is relevant as current design methods often largely underestimate the shaft capacity of piles in sands, thus resulting in an over-conservative design. The proposed approach is based on explicitly modelling the thin cylinder of soil surrounding the pile, where strain localization concentrates (shear band), and on the fundamental mechanic behaviour of sandy soils (e.g. dilatancy, softening). This approach is both simple and easy to apply. Results of a broad parametric study involving axially loaded single piles embedded in different sandy soils are presented, highlighting that relative density and grain size distribution mainly affect the shaft capacity. The capability of the procedure to predict shaft friction is checked against data from a well-documented full-scale axial load test on instrumented pile. Some suggestions for calibration and application of the method are also reported. © 2014 Springer-Verlag Berlin Heidelberg.
2014
shaft friction; sand; bored piles; dilatancy; shear band; soil grading
01 Pubblicazione su rivista::01a Articolo in rivista
A numerical approach to estimate shaft friction of bored piles in sands / Ylenia, Mascarucci; Miliziano, Salvatore; Alessandro, Mandolini. - In: ACTA GEOTECHNICA. - ISSN 1861-1125. - STAMPA. - 9:3(2014), pp. 547-560. [10.1007/s11440-014-0305-4]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/561031
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