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Experimental investigation of reverse end bearing of offshore shallow foundations

Experimental investigation of reverse end bearing of offshore shallow foundations
Experimental investigation of reverse end bearing of offshore shallow foundations

Shallow skirted foundations can mobilize uplift resistance from end bearing in the short to medium term. However, uncertainty exists over the magnitude of reverse end bearing resistance compared with resistance in compression, and how this might be affected by a gap between the external face of the foundation skirt and the adjacent soil. The study presented in this paper explores this problem through centrifuge model tests, investigating the effect of skirt embedment ratio on (i) the magnitude of reverse end bearing capacity compared with compression capacity, (ii) the uplift displacement associated with spontaneous loss of suction during uplift, and (iii) the existence of a vertical gap along the external skirt-soil interface. The results show that (i) peak uplift capacity equivalent to compression capacity can be mobilized for a fully sealed foundation with an intact skirt-soil interface, (ii) suction required for reverse end bearing can be maintained through considerable foundation displacement, even for a low skirt embedment ratio, and (iii) the presence of a vertical gap along the external skirt-soil interface causes abrupt loss of suction beneath the top plate after minimal foundation displacement, with subsequent uplift capacity being markedly reduced.

Bearing capacity, Centrifuge modelling, Clays, Footings-foundations, Offshore engineering, Suction
0008-3674
1022-1033
Mana, Divya S.K.
14fc0e59-d5c5-4af9-a0d9-0f18976f6f6b
Gourvenec, Susan
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8
Randolph, Mark F.
75caa33a-e630-4ae8-84cd-758797bf9633
Mana, Divya S.K.
14fc0e59-d5c5-4af9-a0d9-0f18976f6f6b
Gourvenec, Susan
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8
Randolph, Mark F.
75caa33a-e630-4ae8-84cd-758797bf9633

Mana, Divya S.K., Gourvenec, Susan and Randolph, Mark F. (2013) Experimental investigation of reverse end bearing of offshore shallow foundations. Canadian Geotechnical Journal, 50 (10), 1022-1033. (doi:10.1139/cgj-2012-0428).

Record type: Article

Abstract

Shallow skirted foundations can mobilize uplift resistance from end bearing in the short to medium term. However, uncertainty exists over the magnitude of reverse end bearing resistance compared with resistance in compression, and how this might be affected by a gap between the external face of the foundation skirt and the adjacent soil. The study presented in this paper explores this problem through centrifuge model tests, investigating the effect of skirt embedment ratio on (i) the magnitude of reverse end bearing capacity compared with compression capacity, (ii) the uplift displacement associated with spontaneous loss of suction during uplift, and (iii) the existence of a vertical gap along the external skirt-soil interface. The results show that (i) peak uplift capacity equivalent to compression capacity can be mobilized for a fully sealed foundation with an intact skirt-soil interface, (ii) suction required for reverse end bearing can be maintained through considerable foundation displacement, even for a low skirt embedment ratio, and (iii) the presence of a vertical gap along the external skirt-soil interface causes abrupt loss of suction beneath the top plate after minimal foundation displacement, with subsequent uplift capacity being markedly reduced.

Text
2013 Canadian Geotechnical Journal 50_10_1022-1033 Mana et al. - Accepted Manuscript
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More information

Published date: September 2013
Keywords: Bearing capacity, Centrifuge modelling, Clays, Footings-foundations, Offshore engineering, Suction

Identifiers

Local EPrints ID: 414562
URI: https://eprints.soton.ac.uk/id/eprint/414562
ISSN: 0008-3674
PURE UUID: 42f2ff82-6cff-4a8f-b21f-94b56c594853
ORCID for Susan Gourvenec: ORCID iD orcid.org/0000-0002-2628-7914

Catalogue record

Date deposited: 04 Oct 2017 16:30
Last modified: 17 Jul 2019 00:25

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