This paper presents a numerical based study on the undrained load capacity of a typical torpedo anchor embedded in a purely cohesive isotropic soil using a three-dimensional nonlinear finite element (FE) model. In this model, the soil is simulated with solid elements capable of representing its nonlinear physical behavior as well as the large deformations involved. The torpedo anchor is also modeled with solid elements and its complex geometry is represented. Moreover, the anchor-soil interaction is addressed with contact finite elements that allow relative sliding with friction between the surfaces in contact. Various analyses are conducted in order to understand the response of this type of anchor when different soil undrained shear strengths, load directions as well as number and width of flukes are considered. The obtained results point to two different failure mechanisms: one that mobilizes a great amount of soil and is directly related to its lateral resistance; and a second one that mobilizes a small amount of soil and is related to the vertical resistance of the soil. Besides, the total contact area of the anchor seems to be an important parameter in the determination of its load capacity and, consequently, the increase of the undrained shear strength and the number of flukes and/or their width significantly increases the load capacity of the anchor.
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ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering
May 31–June 5, 2009
Honolulu, Hawaii, USA
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4347-5
PROCEEDINGS PAPER
Undrained Load Capacity of Torpedo Anchors in Cohesive Soils
Cristiano S. de Aguiar,
Cristiano S. de Aguiar
Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
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Jose´ Renato M. de Sousa,
Jose´ Renato M. de Sousa
Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
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Gilberto Bruno Ellwanger,
Gilberto Bruno Ellwanger
Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
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Elisabeth de Campos Porto,
Elisabeth de Campos Porto
PETROBRAS, Rio de Janeiro, Brazil
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Cipriano Jose´ de M. Ju´nior,
Cipriano Jose´ de M. Ju´nior
PETROBRAS, Rio de Janeiro, Brazil
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Diego Foppa
Diego Foppa
PETROBRAS, Rio de Janeiro, Brazil
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Cristiano S. de Aguiar
Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
Jose´ Renato M. de Sousa
Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
Gilberto Bruno Ellwanger
Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
Elisabeth de Campos Porto
PETROBRAS, Rio de Janeiro, Brazil
Cipriano Jose´ de M. Ju´nior
PETROBRAS, Rio de Janeiro, Brazil
Diego Foppa
PETROBRAS, Rio de Janeiro, Brazil
Paper No:
OMAE2009-79465, pp. 253-265; 13 pages
Published Online:
February 16, 2010
Citation
de Aguiar, CS, de Sousa, JRM, Ellwanger, GB, de Campos Porto, E, de M. Ju´nior, CJ, & Foppa, D. "Undrained Load Capacity of Torpedo Anchors in Cohesive Soils." Proceedings of the ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. Volume 7: Offshore Geotechnics; Petroleum Technology. Honolulu, Hawaii, USA. May 31–June 5, 2009. pp. 253-265. ASME. https://doi.org/10.1115/OMAE2009-79465
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