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Analysis of the added mass term in soil bearing capacity problems

Analysis of the added mass term in soil bearing capacity problems
Analysis of the added mass term in soil bearing capacity problems
This technical note presents a simplified method for quantifying the added mass of the soil that is mobilised as part of the failure mechanism around a foundation during rapid loading, and the resulting additional soil resistance. This note focuses on the solutions for an embedded plate anchor, which is a potential foundation system for offshore floating facilities. In current practice, only the shear strength of the soil surrounding the foundation is considered in calculations of the ultimate bearing capacity. However, the solutions presented in this technical note show that the added mass of the soil involved in the failure mechanism around the foundation can result in a significant increase in ultimate bearing capacity during extreme dynamic wave loading events. These lead to snatch loads transmitted to the anchoring and mooring system, which are high but brief. The technical note provides a general approach applicable to all foundation types, and illustrates the effect of the added mass term and the additional capacity for an embedded plate anchor with typical input conditions.
Anchors & anchorages, Bearing capacity, Footings/foundations, Offshore engineering
80-87
Kwa, Katherine
18faee0d-75d9-4683-a2c8-604625eecbb0
Weymouth, Gabriel
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
Martin, Chris
5b19628a-f512-4cda-989e-8188b2e00eca
Kwa, Katherine
18faee0d-75d9-4683-a2c8-604625eecbb0
Weymouth, Gabriel
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
Martin, Chris
5b19628a-f512-4cda-989e-8188b2e00eca

Kwa, Katherine, Weymouth, Gabriel, White, David and Martin, Chris (2021) Analysis of the added mass term in soil bearing capacity problems. Géotechnique Letters, 11 (1), 80-87. (doi:10.1680/jgele.20.00097).

Record type: Article

Abstract

This technical note presents a simplified method for quantifying the added mass of the soil that is mobilised as part of the failure mechanism around a foundation during rapid loading, and the resulting additional soil resistance. This note focuses on the solutions for an embedded plate anchor, which is a potential foundation system for offshore floating facilities. In current practice, only the shear strength of the soil surrounding the foundation is considered in calculations of the ultimate bearing capacity. However, the solutions presented in this technical note show that the added mass of the soil involved in the failure mechanism around the foundation can result in a significant increase in ultimate bearing capacity during extreme dynamic wave loading events. These lead to snatch loads transmitted to the anchoring and mooring system, which are high but brief. The technical note provides a general approach applicable to all foundation types, and illustrates the effect of the added mass term and the additional capacity for an embedded plate anchor with typical input conditions.

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Accepted/In Press date: 28 January 2021
e-pub ahead of print date: 9 February 2021
Published date: March 2021
Keywords: Anchors & anchorages, Bearing capacity, Footings/foundations, Offshore engineering

Identifiers

Local EPrints ID: 446724
URI: http://eprints.soton.ac.uk/id/eprint/446724
PURE UUID: a04d0a13-b486-4f89-82b2-acd89d1d3457
ORCID for Gabriel Weymouth: ORCID iD orcid.org/0000-0001-5080-5016
ORCID for David White: ORCID iD orcid.org/0000-0002-2968-582X

Catalogue record

Date deposited: 19 Feb 2021 17:31
Last modified: 26 Nov 2021 03:12

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Contributors

Author: Katherine Kwa
Author: David White ORCID iD
Author: Chris Martin

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