Seismic assessments for offshore shallow foundations in carbonate sediments

D. O'Driscoll, N. Yamamoto, A. Amodio, M. F. Bransby, C. T. Erbrich, Z. J. Westgate

Research output: Chapter in Book/Conference paperConference paper

Abstract

This paper presents a methodology for the cost-effective seismic geotechnical design of shallow foundations for typical subsea structures in carbonate sediments. This methodology is focused on the particular design issues experienced in these soils and so the methodology includes the calculation of: (i) seismic shear stress and excess pore pressures induced in the soil column during a seismic event; (ii) post-seismic foundation settlement, which can be a governing design criterion in carbonate sediments due to their compressibility; (iii) bearing capacity during the seismic event allowing for appropriate strength degradation under the cyclic seismic load. Finally, the paper discusses conditions where the underlying 1-D shaking assumption of the simplified approach is not appropriate, with an example of a high aspect ratio subsea structure where 2-D and 3-D dynamic analyses were performed.

Original languageEnglish
Title of host publicationOffshore Technology Conference 2016, OTC 2016
PublisherOffshore Technology Conference
Pages4397-4409
Number of pages13
Volume5
ISBN (Electronic)9781510824294
DOIs
Publication statusPublished - 1 Jan 2016
Externally publishedYes
EventOffshore Technology Conference 2016 - Houston, United States
Duration: 2 May 20165 May 2016

Conference

ConferenceOffshore Technology Conference 2016
Abbreviated titleOTC 2016
CountryUnited States
CityHouston
Period2/05/165/05/16

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  • Cite this

    O'Driscoll, D., Yamamoto, N., Amodio, A., Bransby, M. F., Erbrich, C. T., & Westgate, Z. J. (2016). Seismic assessments for offshore shallow foundations in carbonate sediments. In Offshore Technology Conference 2016, OTC 2016 (Vol. 5, pp. 4397-4409). Offshore Technology Conference. https://doi.org/10.4043/27271-MS