Foundation Response of Arctic Structures to Time-Dependent Ice Loadings

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by David R. Williams, EBA Engineering Consultants Ltd, Edmonton, Alberta, Canada,
Robert G. Bea, EBA Engineering Consultants Ltd, Edmonton, Alberta, Canada,

Document Type: Proceeding Paper

Part of: Civil Engineering in the Arctic Offshore

Abstract: Arctic structures are subjected to a variety of time-dependent loadings, the most important of which are those due to ice. An approach is presented for estimating the strength and deformation response of foundation soils supporting arctic gravity structures that are subjected to various rates, durations, and magnitudes of ice loadings. Results of laboratory tests on seabed silty clay samples from the Alaskan Beaufort Sea Shelf are summarized and used to characterize the soil time-dependent strength and deformation parameters. Cumulative deformations are estimated for a severe winter ice loading scenario and compared with the peak deformation estimate based on static parameters. The cumulative deformations due to time-dependent loadings are substantially larger than those inferred from the peak static loading. Significant reductions in capacity are implicated.

Subject Headings: Ice loads | Foundations | Soil strength | Soil deformation | Time dependence | Dynamic loads | Gravity loads | Structural response | Offshore structures | Arctic

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