Multidirectional perpendicular drained cyclic behaviour of a marine sand
Multidirectional perpendicular drained cyclic behaviour of a marine sand
This study investigates the multidirectional perpendicular behaviour of a marine sand using the Variable Dynamic Direct Cyclic Simple Shear (VDDCSS) device. The loading simulates misaligned wind and wave forces, common at certain offshore sites. VDDCSS tests were conducted in drained conditions and at two relative densities (Dr). For comparison a suite of unidirectional only cyclic tests was also completed. Results suggest that the constant stress amplitude (\zetab,x) (sustained load in the x direction) is a critical parameter across all loading regimes for both densities. A higher \zetab,x increases the cyclic resistance of the soil demonstrated by increasing stiffness with cycles. The cyclic amplitude (\zetab,y) (cyclic load in the y direction) and cyclic asymmetry (\zetac,y) dictate the magnitude and direction of strain, respectively. Furthermore, multidirectional tests demonstrate lower cyclic resistance compared to unidirectional tests through increased accumulated strain (\gammaacc). The results highlight the importance of accurately modelling multidirectional soil behaviour in the context of offshore foundation design.
Kathy Z. Wen; Roisin M. Buckley; Byron W. Byrne
5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025)
3 - Constitutive models and soil behaviour modelling
https://doi.org/10.53243/ISFOG2025-455
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