Abstract
Accurate estimates of pile settlement are key for efficient design of axially loaded piles. Calculations of pile settlement can be simplified using one-dimensional “t-z” curves describing pile settlement at a certain depth as a function of side friction. In the realm of this simplified framework, theoretical “t-z” curves can be derived by substituting an attenuation function describing the variation of shear stress with distance from the pile, into a soil constitutive model relating shear strain to shear stress, then integrating with respect to distance to get the settlement at the pile circumference due to an applied shear stress. A handful of analytical “t-z” curves are available in the literature using the concentric cylinder model to define an attenuation function; these include solutions for linear-elastic, power-law and hyperbolic constitutive models. However, radially homogeneous soil has often been assumed, ignoring the effect of the pile installation resulting in unconservative calculations of pile settlement. This paper considers the installation of the pile, resulting in a radially variable shear modulus distribution in the surrounding soil. A radial inhomogeneity correction factor has been developed for selected constitutive models based on two simplified functions for the soil inhomogeneity, which can be applied to the previously derived “t-z” curves produced assuming radially homogeneous soil. The performance of this simplified method is investigated.
Highlights
Accurate estimation of pile settlement usually requires complex three-dimensional analysis, such as boundary element method solutions (e.g. Poulos and Davis 1968; Butterfield and Banerjee 1971; Poulos and Davis 1980), finite element method solutions (e.g. Syngros 2004, Ottaviani 1975) and rigorous analytical solutions (Mylonakis 2001, Anoyatis et al 2019, Anoyatis and Mylonakis 2020)
In the realm of this simplified framework, theoretical “t-z” curves can be derived by substituting an attenuation function describing the variation of shear stress with distance from the pile, into a soil constitutive model relating shear strain to shear stress, integrating with respect to distance to get the settlement at the pile circumference due to an applied shear stress
This paper considers the installation of the pile, resulting in a radially variable shear modulus distribution in the surrounding soil
Summary
This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Deep Foundations Institute at http://www.dfi.org/pubdetail.asp?id=3648. Please refer to any applicable terms of use of the publisher. General rights This document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/red/research-policy/pure/user-guides/ebr-terms/. Author 2 Jamie Crispin PhD Student Department of Civil Engineering, University of Bristol, Bristol, UK ORCID ID: 0000-0003-3074-8493
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