Xu, D. and Madabhushi, S. and Harris, J. and Whitehouse, R.J.S. (2025) On modelling of offshore scour protection rock berms under seismic loading. Ocean Engineering, 341 (2).
Full text not available from this repository.Abstract
Understanding the behaviour of rock-scour protection berms under seismic liquefaction will be key to the construction and service of newly planned windfarms in the west coast of North America and Southeast Asia. These farms will play a crucial role in harnessing the abundant and indispensable source of renewable energy which recently has seen rapid expansion. This paper compares dynamic, saturated centrifuge tests in which the rock berm was modelled using scaled individual rocks and for comparison the rock berm was modelled using an aluminium plate to represent a continuum. The results show that the two methods (rock berm vs. plate foundation) result in very different behaviour due to the ingress of sand in between the rocks seen in the physical experiments is not replicated in the continuum-based plate foundation models. It is seen that excess pore water pressure dissipation under the rock is much faster than that of the plate foundation, due to reduced drainage paths. In addition, there are differences in the resulting settlements depending on the size of the input motion and number of cycles in the earthquake. For large motions, the rocks forming the rock berm settle more. For smaller input motions, the rocks settle less compared to a continuum-based plate foundation. In addition, finite element based numerical analyses were carried out. The results of these analyses show that these rock berms might not be modelled as plate foundations. All in all, this has implications for numerical studies on the behaviour of rock berms under seismic liquefaction.
| Item Type: | Article |
|---|---|
| Subjects: | Coasts > General Coasts > Sediment transport and scour Maritime > General |
| Divisions: | Coastal Maritime |
| Depositing User: | Helen Stevenson |
| Date Deposited: | 02 Sep 2025 13:52 |
| Last Modified: | 02 Sep 2025 13:52 |
| URI: | http://eprints.hrwallingford.com/id/eprint/1699 |
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