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Construction of simplified design p-y curves for liquefied soils

Lombardi, D, Dash, SR, Bhattacharya, Subhamoy, Ibraim, E, Wood, DM and Taylor, CA (2017) Construction of simplified design p-y curves for liquefied soils Geotechnique, 67 (3). pp. 216-227.

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In practice, laterally loaded piles are most often modelled using a ‘Beam-on-Nonlinear-Winkler-Foundation’ (BNWF) approach. While well calibrated p-y curves exist for non-liquefied soils (e.g. soft clay and sands), the profession still lacks reliable p-y curves for liquefied soils. In fact, the latter should be consistent with the observed strain-hardening behaviour exhibited by liquefied samples in both element and physical model tests. It is recognised that this unusual strain-hardening behaviour is induced by the tendency of the liquefied soil to dilate upon undrained shearing, which ultimately results in a gradual decrease of excess pore pressure and consequent increase in stiffness and strength. The aim of this paper is twofold. First it proposes an easy-to-use empirical model for constructing stress-strain relationships for liquefied soils. This only requires three soil parameters which can be conveniently determined by means of laboratory tests, such as a cyclic triaxial and cyclic simple shear tests. Secondly, a method is illustrated for the construction of p-y curves for liquefiable soils from the proposed stress-strain model. This involves scaling of stress and strain into compatible soil reaction p and pile deflection y, respectively. The scaling factors for stress and strain axis are computed following an energy-based approach, analogous to the upper-bound method used in classical plasticity theory. Finally, a series of results from centrifuge tests are presented, whereby p-y curves are back-calculated from available experimental data and qualitatively compared with that proposed by the authors.

Item Type: Article
Subjects : Civil & Environmental Engineering
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
Lombardi, D
Dash, SR
Ibraim, E
Wood, DM
Taylor, CA
Date : 7 March 2017
DOI : 10.1680/jgeot.15.P.116
Copyright Disclaimer : This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Uncontrolled Keywords : pile foundation, stress-strain response, p-y curves, liquefied soil, dynamic soil-structure interaction, geotechnical centrifuge.
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 15 Sep 2016 10:48
Last Modified : 16 Jan 2019 17:08

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