Strength-Deformation Properties of Arctic Silt

by Charles C. Ladd, MIT, Cambridge, MA, USA,
Jeffrey S. Weaver, MIT, Cambridge, MA, USA,
John T. Germaine, MIT, Cambridge, MA, USA,
David P. Sauls, MIT, Cambridge, MA, USA,

Document Type: Proceeding Paper

Part of: Civil Engineering in the Arctic Offshore


Hydrocarbon exploration and production activities in the Beaufort Sea require construction of gravity structures capable of withstanding extremely large ice loads at sites where the subsea soil profile often consists of Arctic silts overlying relic permafrost. These conditions pose two unusual foundation design problems: lack of experience with structures where horizontal forces constitute the dominant design load; and the highly variable and unique nature of arctic silts compared to other offshore soil deposits. Classification and related properties of Arctic silts located in Harrison Bay, Alaska are summarized. The effect of temperature on results of consolidation tests is discussed. The main focus is on undrained stress-strain-strength anisotropy of normally consolidated Arctic silt.

Subject Headings: Soil properties | Silt | Soil strength | Soil deformation | Hydrologic properties | Structural behavior | Ice loads | Offshore structures | Arctic | Beaufort Sea | Alaska | United States

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