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Comparison of failure modes below footings on carbonate and silica sands

Comparison of failure modes below footings on carbonate and silica sands
Comparison of failure modes below footings on carbonate and silica sands

To investigate the differences in failure mechanisms beneath vertically loaded shallow foundations on silica and carbonate sands by way of particle image velocimetry analysis, 1g and centrifuge model tests have been performed. A comparison of silica and carbonate sand behaviour at low stresses and low initial soil density was made possible by 1g scaling conditions, while centrifuge conditions focused on high stresses and high soil density. This strategy provided separate insights into the effects of the compressibility and crushability of both sands. Results indicated a distinct difference in failure mode between the two sands. The footing on silica sand exhibited a shallow failure mode with large localised strains close to the soil surface. In contrast, the footing on carbonate sand mobilised strains lower in magnitude over a greater depth. The increased stress level in the centrifuge reduced the surface heave and resulted in deeper failure mechanisms in both sands. The bearing capacity factor for the experimental results could be backcalculated with simple limit analysis solutions, provided that different friction angles were used to account for the variation of stress levels. However, such an approach masks the influence of compressibility on the failure mechanism in the loose and compressible cases by requiring a lower friction angle than is realistically possible.

Centrifuge modelling, Footings, Foundations, Sands
1346-213X
1-12
Dijkstra, Jelke
31aec54e-13fa-4d51-803b-9a2dbad5b0ef
Gaudin, Christophe
fb56af7b-bc67-429c-a507-d26249fba84d
White, David J.
a986033d-d26d-4419-a3f3-20dc54efce93
Dijkstra, Jelke
31aec54e-13fa-4d51-803b-9a2dbad5b0ef
Gaudin, Christophe
fb56af7b-bc67-429c-a507-d26249fba84d
White, David J.
a986033d-d26d-4419-a3f3-20dc54efce93

Dijkstra, Jelke, Gaudin, Christophe and White, David J. (2013) Comparison of failure modes below footings on carbonate and silica sands. International Journal of Physical Modelling in Geotechnics, 13 (1), 1-12. (doi:10.1680/ijpmg.12.00004).

Record type: Article

Abstract

To investigate the differences in failure mechanisms beneath vertically loaded shallow foundations on silica and carbonate sands by way of particle image velocimetry analysis, 1g and centrifuge model tests have been performed. A comparison of silica and carbonate sand behaviour at low stresses and low initial soil density was made possible by 1g scaling conditions, while centrifuge conditions focused on high stresses and high soil density. This strategy provided separate insights into the effects of the compressibility and crushability of both sands. Results indicated a distinct difference in failure mode between the two sands. The footing on silica sand exhibited a shallow failure mode with large localised strains close to the soil surface. In contrast, the footing on carbonate sand mobilised strains lower in magnitude over a greater depth. The increased stress level in the centrifuge reduced the surface heave and resulted in deeper failure mechanisms in both sands. The bearing capacity factor for the experimental results could be backcalculated with simple limit analysis solutions, provided that different friction angles were used to account for the variation of stress levels. However, such an approach masks the influence of compressibility on the failure mechanism in the loose and compressible cases by requiring a lower friction angle than is realistically possible.

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More information

Published date: March 2013
Keywords: Centrifuge modelling, Footings, Foundations, Sands

Identifiers

Local EPrints ID: 419919
URI: https://eprints.soton.ac.uk/id/eprint/419919
ISSN: 1346-213X
PURE UUID: 3aa377aa-a071-4079-9caf-2be3019e0a9a
ORCID for David J. White: ORCID iD orcid.org/0000-0002-2968-582X

Catalogue record

Date deposited: 23 Apr 2018 16:30
Last modified: 19 Jul 2019 10:58

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