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Open AccessArticle

Dynamic Response of Offshore Open-Ended Pile under Lateral Cyclic Loadings

1
School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China
2
Postdoctoral research fellow, Hydraulic Engineering Post-doctoral Scientific Research Station, Zhejiang University, Hangzhou 310058, China
3
Key Laboratory of Offshore Geotechnics and Material of Zhejiang Province, Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
4
Department of Civil and Environmental Engineering, Shantou University, Shantou 515063, China
5
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
6
Qingjian Group Co., Ltd, Qingdao 266071, China
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2019, 7(5), 128; https://doi.org/10.3390/jmse7050128
Received: 28 March 2019 / Revised: 28 April 2019 / Accepted: 30 April 2019 / Published: 3 May 2019
(This article belongs to the Special Issue Coastal Geohazard and Offshore Geotechnics)
Foundations for offshore wind turbines (OWTs) are mainly open-ended piles that are subjected to cyclic loadings caused by winds, waves and currents. This study aims to investigate the dynamic responses of open-ended pipe pile under lateral cyclic loadings, as well as the characteristics of the soil plug and surrounding soil. Both large-scale indoor model test and discrete element simulation were adopted in this study. The test results show that the resistance of each part of the pipe pile increases linearly with depth during the process of pile driving. The pile side resistance degradation effect was also observed along with the friction fatigue. The soil plug formation rate decreases gradually with an increase in the pile depth. The influence range in the surrounding soil is about 5~6 times of the pile diameter. The cumulative displacement of the pile head increases with the number of cycles. Lateral tangential stiffness and lateral ultimate bearing capacity decreases with an increase in number of cycles. The severe disturbance range of soil around the pile is 2~3 times of the pile diameter. The center of rotation of the pile body is about 0.8 times of the pile body depth. The side frictional resistance and lateral pressure of the pile body is found to fluctuate along the pile body. Additionally, the lateral pressure and side friction resistance decreases gradually with decreasing tendency of the former more than the latter. View Full-Text
Keywords: open-ended pile; soil plug; offshore wind turbines; lateral cyclic loading; model test; discrete element simulation open-ended pile; soil plug; offshore wind turbines; lateral cyclic loading; model test; discrete element simulation
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MDPI and ACS Style

Liu, J.; Guo, Z.; Zhu, N.; Zhao, H.; Garg, A.; Xu, L.; Liu, T.; Fu, C. Dynamic Response of Offshore Open-Ended Pile under Lateral Cyclic Loadings. J. Mar. Sci. Eng. 2019, 7, 128.

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