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Design of Ice Protection Barrier in Caspian Sea

[+] Author Affiliations
H. J. Lengkeek

Consulting Engineers B.V., Deventer, The Netherlands

K. R. Croasdale

K. R. Croasdale & Associates, Ltd., Calgary, AB, Canada

M. Metge

Agip KCO, The Hague, The Netherlands

Paper No. OMAE2003-37411, pp. 831-837; 7 pages
doi:10.1115/OMAE2003-37411
From:
  • ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 3: Materials Technology; Ocean Engineering; Polar and Arctic Sciences and Technology; Workshops
  • Cancun, Mexico, June 8–13, 2003
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3683-5 | eISBN: 0-7918-3672-X
  • Copyright © 2003 by ASME

abstract

Several offshore platforms and artificial islands will be constructed in the Caspian Sea for the exploration and production of oil. In some cases, vulnerable structures can be protected against severe ice loading using rock mound barriers. These barriers will be constructed in shallow water on a soft sediment layer. This paper discusses the assessment of ice interaction scenarios and the FEM stability analyses for the design of the ice barriers. In normal winters, rock slopes will cause the thin ice to fail in bending at low forces creating ice rubble. In this scenario, barrier stability has to be checked against local edge failure due to initial interaction of thin ice. Later in the winter, global failure has to be evaluated in the situation when ice rubble has extended only to the toe of the rock slope and thick ice acts against the ice-rubble, rock-mound combination. Various other extreme scenarios require analysis including direct action by thick ice and a frozen-in condition, which prevents edge failure and encourages decapitation if the barrier freeboard is low. The stability of the barriers under ice loading has been analyzed with a FEM program. From the analyses several failure types can be recognized which can also be found in literature.

Copyright © 2003 by ASME
Topics: Design , Ice , Seas

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