Enhancement of bearing capacity from consolidation: due to changing strength or failure mechanism?

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Bearing capacity of shallow foundations is higher following preload (or self-weight)-induced consolidation because the soil strength changes, and perhaps because the failure mechanism changes. Previous studies have illustrated this effect by plotting or predicting changes in either bearing capacity factor or strength. In this study, the relative contribution of these two effects is explored. This is achieved by formalising a definition of bearing capacity factor, which is described in terms of the average strength mobilised in the deformation mechanism at failure. Using the alternative definition of bearing capacity factor, the gain in foundation capacity is shown to be almost entirely due to changes in soil strength, rather than bearing capacity factor, which remains largely unaffected by the strength gains. This observation should encourage future studies into consolidated bearing capacity to present gains in capacity in terms of changes in mobilised strength rather than changes in bearing capacity factors, and supports the use of prediction methods that focus on defining the change in soil strength.

Original languageEnglish
Pages (from-to)166-173
Number of pages8
JournalGeotechnique
Volume69
Issue number2
DOIs
Publication statusPublished - Feb 2019

Cite this

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title = "Enhancement of bearing capacity from consolidation: due to changing strength or failure mechanism?",
abstract = "Bearing capacity of shallow foundations is higher following preload (or self-weight)-induced consolidation because the soil strength changes, and perhaps because the failure mechanism changes. Previous studies have illustrated this effect by plotting or predicting changes in either bearing capacity factor or strength. In this study, the relative contribution of these two effects is explored. This is achieved by formalising a definition of bearing capacity factor, which is described in terms of the average strength mobilised in the deformation mechanism at failure. Using the alternative definition of bearing capacity factor, the gain in foundation capacity is shown to be almost entirely due to changes in soil strength, rather than bearing capacity factor, which remains largely unaffected by the strength gains. This observation should encourage future studies into consolidated bearing capacity to present gains in capacity in terms of changes in mobilised strength rather than changes in bearing capacity factors, and supports the use of prediction methods that focus on defining the change in soil strength.",
keywords = "bearing capacity, consolidation, footings/foundations, numerical modelling, shear strength, CIRCULAR FOUNDATIONS",
author = "Stanier, {S. A.} and White, {D. J.}",
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Enhancement of bearing capacity from consolidation : due to changing strength or failure mechanism? / Stanier, S. A.; White, D. J.

In: Geotechnique, Vol. 69, No. 2, 02.2019, p. 166-173.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Enhancement of bearing capacity from consolidation

T2 - due to changing strength or failure mechanism?

AU - Stanier, S. A.

AU - White, D. J.

PY - 2019/2

Y1 - 2019/2

N2 - Bearing capacity of shallow foundations is higher following preload (or self-weight)-induced consolidation because the soil strength changes, and perhaps because the failure mechanism changes. Previous studies have illustrated this effect by plotting or predicting changes in either bearing capacity factor or strength. In this study, the relative contribution of these two effects is explored. This is achieved by formalising a definition of bearing capacity factor, which is described in terms of the average strength mobilised in the deformation mechanism at failure. Using the alternative definition of bearing capacity factor, the gain in foundation capacity is shown to be almost entirely due to changes in soil strength, rather than bearing capacity factor, which remains largely unaffected by the strength gains. This observation should encourage future studies into consolidated bearing capacity to present gains in capacity in terms of changes in mobilised strength rather than changes in bearing capacity factors, and supports the use of prediction methods that focus on defining the change in soil strength.

AB - Bearing capacity of shallow foundations is higher following preload (or self-weight)-induced consolidation because the soil strength changes, and perhaps because the failure mechanism changes. Previous studies have illustrated this effect by plotting or predicting changes in either bearing capacity factor or strength. In this study, the relative contribution of these two effects is explored. This is achieved by formalising a definition of bearing capacity factor, which is described in terms of the average strength mobilised in the deformation mechanism at failure. Using the alternative definition of bearing capacity factor, the gain in foundation capacity is shown to be almost entirely due to changes in soil strength, rather than bearing capacity factor, which remains largely unaffected by the strength gains. This observation should encourage future studies into consolidated bearing capacity to present gains in capacity in terms of changes in mobilised strength rather than changes in bearing capacity factors, and supports the use of prediction methods that focus on defining the change in soil strength.

KW - bearing capacity

KW - consolidation

KW - footings/foundations

KW - numerical modelling

KW - shear strength

KW - CIRCULAR FOUNDATIONS

U2 - 10.1680/jgeot.17.T.030

DO - 10.1680/jgeot.17.T.030

M3 - Article

VL - 69

SP - 166

EP - 173

JO - Géotechnique

JF - Géotechnique

SN - 0016-8505

IS - 2

ER -