Effect of foundation flexibility on consolidation gains in undrained capacity

Xiaowei Feng, Susan Gourvenec

Research output: Chapter in Book/Conference paperConference paper

Abstract

Subsea mudmats are extensively deployed to support subsea infrastructure such as inline structures, pipeline end terminations and manifolds. In fine-grained seabeds, consolidation during the delay between mudmat installation and operation of the associated pipelines increases the geotechnical capacity of the mudmat compared to that immediately following mudmat set down. Gain in consolidated undrained capacity has previously been investigated by assuming the mudmat behaves as a rigid body. However, rigidity index decreases with increasing mudmat size, and mudmats are becoming larger to resist increasingly large and complex loads and due to developments on softer seabeds. The enhancement in undrained shear strength of the seabed around a mudmat due to consolidation under self-weight is affected by foundation rigidity, due to the dependence of the stress distribution in the soil domain underneath the mudmat on the flexibility of the mudmat. In this paper, the effect of rigidity index of mudmats on post-installation consolidation, the associated increase in strength of the subsoil and consolidated, undrained capacity is presented.
Original languageEnglish
Title of host publicationProceedings of the 8th International Conference on Offshore Site Investigation and Geotechnics (OSIG 2017)
Place of PublicationLondon, UK
PublisherSociety for Underwater Technology
Pages742-748
Volume2
ISBN (Electronic)9780906940587
ISBN (Print)0906940583
Publication statusPublished - 2017
Event8th Offshore Site Investigation and Geotechnics International Conference 2017 - London, United Kingdom
Duration: 12 Sep 201714 Sep 2017
Conference number: 8
http://www.sutconnects.com/

Conference

Conference8th Offshore Site Investigation and Geotechnics International Conference 2017
Abbreviated titleOSIG
CountryUnited Kingdom
CityLondon
Period12/09/1714/09/17
Internet address

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