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Bearing capacity and settlement of circular shallow foundations using a nonlinear constitutive relationship


Type

Article

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Authors

McMahon, BT 
Haigh, SK 
Bolton, MD 

Abstract

jats:p The design of shallow foundations is dominated by issues of settlement rather than bearing capacity per se. The ability to predict the settlement of foundations at a given factor of safety is hence of key importance in design. In this paper, the energy method for a linear-elastic, perfectly plastic method utilizing the von Mises’ yield criterion with associated flow developed and reported by McMahon et al. in 2013 is extended to consider the nonlinear behaviour of soil. The energy method is used to investigate the load–settlement behaviour of shallow foundations by utilizing an ellipsoidal cavity-expansion mechanism and deformation fields within the boundaries of the classical Hill and Prandtl mechanisms. An elastic mechanism obtained from an analysis in ABAQUS was also investigated using this energy method. The upper-bound approach demonstrates that the cavity-expansion mechanism produces a better solution at small values of settlement, whereas at greater settlements the Prandtl mechanism is shown to produce a more optimal upper-bound solution. </jats:p>

Description

Keywords

bearing capacity, clays, foundations, plasticity, settlement

Journal Title

Canadian Geotechnical Journal

Conference Name

Journal ISSN

0008-3674
1208-6010

Volume Title

Publisher

Canadian Science Publishing
Sponsorship
The first author would like to thank the financial support he received from the Cambridge Australia Trust (Poynton Scholarship) and the Principals of UK Universities (Overseas Research Students Awards Scheme) throughout his studies in Cambridge.