Study on <i>p</i>-<i>y</i> models for large-diameter pile foundation based on in-situ tests of offshore wind power

WANG Wei; YANG Jun-yi; LIU Jian-ping

doi:10.11779/CJGE202106017

Volume 43 Issue 6

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Chinese Journal of Geotechnical Engineering > 2021 > 43(6): 1131-1138. > DOI: 10.11779/CJGE202106017

WANG Wei, YANG Jun-yi, LIU Jian-ping. Study on p-y models for large-diameter pile foundation based on in-situ tests of offshore wind power[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(6): 1131-1138. DOI: 10.11779/CJGE202106017

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Study on p-y models for large-diameter pile foundation based on in-situ tests of offshore wind power

1.
Institute of Science and Technology, China Three Gorges Corporation, Beijing 100038, China
2.
China Three Gorges Renewables (Group) Co., Ltd., Beijing 100053, China

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Received Date: August 09, 2020
Available Online: December 02, 2022

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Abstract

Abstract

Large steel pipe pile is the most commonly used foundation structure for offshore wind power. However, the adopted design methods for large-diameter piles are p-y models, which are originally proposed based on many small-diameter pile tests for offshore oil and gas platforms. The prediction precision of the p-y models is relatively conservative, and its reliability is not clear. Thus, a modified p-y model for clay is proposed considering the influences of pile diameter and soil layer depth. Based on the data of in-situ pile tests of offshore wind power, the accuracies of p-y models for clay and sand recommended by the API code and modified p-y model for clay to predict the lateral soil resistance, pile deformation and bending moment of laterally loaded piles are analyzed and compared. The results show that the p-y model for clay recommended by the API code significantly overestimates the soil resistance of silt-sand and clay soil, and the predicted value using the p-y model for sand is about an order of magnitude higher than the measured one. The modified p-y model for clay can precisely predict the soil resistance of silt-sand and clay soil. Based on the modified p-y model for clay and p-y model sand proposed by Sorensen, the deformation and bending moment of piles in multi-layer seabed can be precisely predicted.
- offshore wind power,
- laterally loaded pile,
- in-situ pile test,
- p-y model

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References

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