Response of Concrete Island Drilling System to Ice Impact Loading

by Shahriar Vahdani, Harding Lawson Assoc, United States,
Donald E. Bruggers, Harding Lawson Assoc, United States,
Sherman B. Wetmore, Harding Lawson Assoc, United States,

Document Type: Proceeding Paper

Part of: Foundation Engineering: Current Principles and Practices


The lateral stability and load/deformation characteristics of the Concrete Island Drilling System structure under ice impact loading conditions were studied. The 300-foot-square (91.5-meter square) concrete island with 5-foot (1.53 m) steel skirts was to be located in shallow waters, just off Seal Island, Alaska in the Beaufort Sea. The two-dimensional analytical model used was, in principal, capable of modelling drained and undrained nonlinear soil behavior, foundation-soil separation, nonlinear frictional behavior of cohesionless soils, and three possible foundation failure mechanisms. The results of our analyses indicate that the failure in silty sands just below the tip of skirts was the controlling failure mechanism.

Subject Headings: Soil analysis | Ice loads | Failure analysis | Cohesionless soils | Two-dimensional models | Concrete | Islands | Drilling | Alaska | United States | Beaufort Sea

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