Performance of offshore wind turbine foundations under cyclic loading is one of the most important issues in designing these structures because they are constantly subjected to cyclic loads from winds and waves. This paper investigates the cyclic behaviour of an over-consolidated marine clay from the Bolders Bank Formation (one of the four main soil units) found at the Sheringham Shoal offshore wind farm in the North Sea. The clay samples are tested in both cyclic undrained triaxial and cyclic direct simple shear apparatuses under various combinations of average and cyclic shear stresses. The result shows that the number of cycles to failure decreases with increasing cyclic shear stress but can change in either direction as the average shear stress increases. The failure modes experienced by the samples tend to depend on the relative magnitude of the two shear stresses applied during testing. This cyclic behaviour of the clay is found to be relatively consistent with the notion represented by the cyclic contour plot framework for designing offshore foundations (developed by the Norwegian Geotechnical Institute).
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The Twenty-third International Offshore and Polar Engineering Conference
June 30–July 5, 2013
Anchorage, Alaska
Cyclic Behaviour of an Over Consolidated Marine Clay
Thi Minh Hue Le;
Thi Minh Hue Le
Norwegian University of Science and Technology
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Gudmund Reidar Eiksund;
Gudmund Reidar Eiksund
Norwegian University of Science and Technology
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Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, Anchorage, Alaska, June 2013.
Paper Number:
ISOPE-I-13-005
Published:
June 30 2013
Citation
Le, Thi Minh Hue, Eiksund, Gudmund Reidar, and Pål Johannes Strøm. "Cyclic Behaviour of an Over Consolidated Marine Clay." Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, Anchorage, Alaska, June 2013.
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