Journal
MARINE STRUCTURES
Volume 86, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.marstruc.2022.103302
Keywords
Rock -socketed monopiles; Lateral static stiffness; p -y curve; Model test; Offshore wind turbines
Categories
Funding
- National Natural Science Foundation of China
- Natural Science Foundation of Jiangsu Province
- [51879097]
- [BK20190074]
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This paper investigates the lateral static stiffness of monopiles in soft rocks under different scenarios through laboratory-scale model tests and numerical analyses. The load-sharing mechanisms of monopiles are found to be significantly influenced by the rock-bearing layer. It is recommended to use p-y curves obtained by piecewise fitting for soil and rock layers or three-dimensional finite element model in the modeling of rock-socked piles.
Monopiles supporting offshore wind turbines (OWTs) sometimes need to be socketed in soft rocks. The lateral stiffness of piles plays a governing role on the fatigue limit state (FLS) and service limit state (SLS) of OWTs, so it needs to be further investigated. In this paper, laboratory-scale model tests and corresponding numerical analyses have been carried out to quantitatively evaluate the lateral static stiffness of monopiles in soft rocks under different scenarios. The results of pile responses, soil/rock resistance and the corresponding p-y curves are presented. Based on the experimental and numerical results, it is found that the load-sharing mechanisms of monopiles are significantly influenced by the rock-bearing layer. For modelling of rock-socked piles, p-y curves obtained by global curve fitting poorly describe the soil/rock resistance near the soil-rock interface, while p-y curves obtained by piecewise fitting for soil and rock layers or three-dimensional finite element model should be the preferred and recommended choices.
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