Experimental study on horizontal bearing capacity of large diameter steel pipe pile for offshore wind farm

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The in-situ tests on lateral monotonic loading are carried out for two offshore large diameter pipe piles which diameter is 1.7 m based on East Sea Bridge offshore wind farm phase Ⅱ project. Good agreement is found between the test results and the Sørensen's correction method based on size effect on p-y curves and the results of API p-y curves method is conservative. It is recommended that detailed geological exploration or testing should be carried out to determine a realistic field of engineering geological characteristics of p-y curves, or the specification recommended p-y curves should be corrected in the design of large diameter steel pipe pile of offshore wind turbine foundations. ©, 2015, Shuili Xuebao/Journal of Hydraulic Engineering. All right reserved.

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There is no standard for rock-socketed pile foundation of offshore wind farm at China and abroad. According to the practical geological and environmental conditions of offshore wind power plant, response of rock-socketed pile under horizontal load was analyzed by using a finite element software, ABAQUS. Then, the parameters of rock-socketed pile, i.e. depth, pile diameter, ratio of pile diameter to thickness, and grouting thickness were investigated by orthogonal analysis and parametric analysis. It is found that the thickness of grouting has little influence on the displacement of pile head. The diameter and the ration of diameter to thickness of pile, rock-socketed depth have significant influence. The displacement of pile tip tends to stable and the bending moment at bottom of pile become zero when the rock-socketed depth reaches 3d p . The maximum Tresca stress of grouting body and 1st principal stress of rock mass decrease with an increase of rock-socketed depth.
A fundamental study of soil response of piles subjected to lateral loads in sand is conducted using the non-linear finite element approach. Stress paths for selected soil elements around a pile subjected to lateral loads are investigated. The effects of pile properties, i.e., stiffness and diameter, and soil properties, i.e., coefficient of horizontal earth pressure and soil dilatancy, on the soil response of a pile subjected to lateral loads are also investigated. Existing methods for predicting ultimate soil resistance of laterally loaded piles in sand are assessed using non-linear finite element analyses. Major findings of this paper are: (1) the effect of pile stiffness (EI) on the p–y response is not significant, (2) ultimate soil resistance has a non-linear relationship with pile diameter, (3) ultimate soil resistance increases with coefficient of horizontal earth pressure, (4) soil dilatancy has a significant influence on ultimate soil resistance, and (5) Hansen’s method provides a better way for predicting ultimate soil resistance of a laterally loaded pile in sand compared with other existing methods.