International Symposium on Frontiers in Offshore Geotechnics, (DFI)
Scour Protection Effects on Laterally Loaded Monopiles
Russell O. Mayall, Harvey J. Burd, Byron W. Byrne, Ross A. McAdam, Richard J. S. Whitehouse, Phillipa L. Slater and Steven G. Heald
Sediment transport processes can cause a loss of soil support around offshore foundations due to scour. Monopile-supported offshore wind turbine support structures are especially susceptible to scour due to the low embedded length-to-diameter ratio of the foundation and a lack of structural redundancy. Scour protection is commonly installed around wind turbine foundations as either a preventative or a remedial measure, but there remains a degree of uncertainty around the geotechnical modelling of soil-foundation interaction for scour protection systems. This paper presents research exploring the influence of scour and scour protection systems on the behaviour of monopile foundations. A physical modelling program was conducted in a flume tank, in which a model monopile-tower structure was subjected to structural dynamics and monotonic lateral loading testing. Scour processes were modelled in the flume tank and model scour protection systems were installed. The paper describes the monotonic lateral loading tests that were conducted as part of the experimental program. Data from the test program are presented and a numerical modelling activity – based on a 1D finite element representation of the embedded monopile – is employed to assess the effectiveness of scour protection material in maintaining the stability of the foundation.
|article #3561; publication #1069 (IC-ISFOG21)|