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Large Displacement Finite Element Analysis of Submarine Slide due to Gas Hydrate Dissociation

[+] Author Affiliations
Jun Liu, Long Yu, Xianjing Kong

Dalian University of Technology, Dalian, Liaoning, China

Yuxia Hu

The University of Western Australia, Perth, WA, Australia

Paper No. OMAE2011-49328, pp. 861-865; 5 pages
doi:10.1115/OMAE2011-49328
From:
  • ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 7: CFD and VIV; Offshore Geotechnics
  • Rotterdam, The Netherlands, June 19–24, 2011
  • ISBN: 978-0-7918-4439-7
  • Copyright © 2011 by ASME

abstract

Gas hydrate dissociation will reduce the stability of the submarine slope, which has been increasingly considered as a potential geohazard. In this study, a conventional geotechnical model is used to simulate gas hydrate dissociation while the thermal and geochemical effects are considered by reducing geotechnical strength parameters (c-φ) and stiffness (E). The stability analysis of submarine slope due to gas hydrate dissociation is carried out using the large displacement finite element model – RITSS (Remeshing and Interpolating Technique with Small Strain model). The strength and stiffness parameters of gas hydrates are reduced gradually after each remesh according to the strength-dissociation relationship. The large displacement analysis procedure considering dissociation is given and the effects of the thickness of the top normal soil layer on slope stability is discussed.

Copyright © 2011 by ASME

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