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Critical skirt spacing for shallow foundations under general loading

Critical skirt spacing for shallow foundations under general loading
Critical skirt spacing for shallow foundations under general loading

Finite-element limit analysis is used to identify the critical internal skirt spacing for the undrained failure of shallow skirted foundations under conditions of plane strain based on the criterion that the confined soil plug should ideally displace as a rigid block, such that optimal bearing capacity is realized. General loading (vertical, horizontal, and moment) is considered for foundations with skirt embedments ranging from 5 to 50% of the foundation breadth in soil having either uniform strength or strength proportional to depth. The results explicitly identify the number of internal skirts required to ensure soil plug rigidity under arbitrary combinations of horizontal and moment loading expressed as a function of the normalized skirt embedment and the maximum expected level of vertical loading as a fraction of the ultimate vertical bearing capacity. It is shown that fewer internal skirts are required with increasing normalized foundation embedment, butmore internal skirts are required with increasing soil strength heterogeneity. The results also indicate the potential for a significant reduction in capacity if insufficient skirts are provided, such that plastic deformation is permitted to occur within the soil plug.

Failure loads, Limit analysis, Offshore structures, Shallow foundations
1090-0241
1554-1566
Mana, Divya S.K.
14fc0e59-d5c5-4af9-a0d9-0f18976f6f6b
Gourvenec, Susan
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8
Martin, Christopher M.
b8ec219b-bff2-4f2b-8d53-736a94c38bb2
Mana, Divya S.K.
14fc0e59-d5c5-4af9-a0d9-0f18976f6f6b
Gourvenec, Susan
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8
Martin, Christopher M.
b8ec219b-bff2-4f2b-8d53-736a94c38bb2

Mana, Divya S.K., Gourvenec, Susan and Martin, Christopher M. (2013) Critical skirt spacing for shallow foundations under general loading. Journal of Geotechnical and Geoenvironmental Engineering, 139 (9), 1554-1566. (doi:10.1061/(ASCE)GT.1943-5606.0000882).

Record type: Article

Abstract

Finite-element limit analysis is used to identify the critical internal skirt spacing for the undrained failure of shallow skirted foundations under conditions of plane strain based on the criterion that the confined soil plug should ideally displace as a rigid block, such that optimal bearing capacity is realized. General loading (vertical, horizontal, and moment) is considered for foundations with skirt embedments ranging from 5 to 50% of the foundation breadth in soil having either uniform strength or strength proportional to depth. The results explicitly identify the number of internal skirts required to ensure soil plug rigidity under arbitrary combinations of horizontal and moment loading expressed as a function of the normalized skirt embedment and the maximum expected level of vertical loading as a fraction of the ultimate vertical bearing capacity. It is shown that fewer internal skirts are required with increasing normalized foundation embedment, butmore internal skirts are required with increasing soil strength heterogeneity. The results also indicate the potential for a significant reduction in capacity if insufficient skirts are provided, such that plastic deformation is permitted to occur within the soil plug.

Text
2013 ASCE J of Geotechnical and Geoenvironmental Engng 139_9_1554-1566 Mana et al. - Accepted Manuscript
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More information

Published date: 2013
Keywords: Failure loads, Limit analysis, Offshore structures, Shallow foundations

Identifiers

Local EPrints ID: 414664
URI: https://eprints.soton.ac.uk/id/eprint/414664
ISSN: 1090-0241
PURE UUID: e52d6825-2d26-43fc-85ed-4653e9831bd7
ORCID for Susan Gourvenec: ORCID iD orcid.org/0000-0002-2628-7914

Catalogue record

Date deposited: 05 Oct 2017 16:30
Last modified: 20 Jul 2019 00:25

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