Experimental and Simulation Study on Dynamic Response of a Bucket-Foundation Site for Offshore Wind Turbines

被引：0
|
作者：
Wang X. [1 ,2 ]
Ma C. [1 ,2 ]
Li J. [1 ,2 ]
机构：
[1] School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin
[2] Tianjin Key Laboratory of Prefabricated Building and Intelligent Construction, Tianjin
来源：
Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2021年 / 54卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Additional stress; Bucket foundation; Centrifuge test; Earthquake; Excess pore-pressure ratio;
D O I：
10.11784/tdxbz202010004
中图分类号：
学科分类号：
摘要：
Bucket foundation is a new type of foundation for offshore wind turbines, and it has the advantages of easy installation, reusability, and low cost. Soil may liquefy under seismic loads, causing a reduction in the soil strength and stiffness, and consequently, a decline in the foundation bearing capacity. A bucket foundation tends to undergo excessive vertical settlement and differential settlement, which severely threatens wind turbine safety. In this study, a series of centrifuge tests were conducted to investigate the seismic response of bucket foundation by recording the time histories of acceleration, pore water pressure, and settlement of surrounding sandy soil. Moreover, numerical analysis was conducted using OpenSees to analyze the dynamic properties of soil, such as stress, strain, and pore pressure. The reliability of the numerical model was verified by the centrifuge test results. The liquefaction characteristics of the bucket foundation were illustrated by considering the soil-foundation interaction, and the influence of aspect ratio was demonstrated. The results showed that the soil under and around the bucket had better resistance to liquefaction owing to the additional stress provided by the foundation. Owing to the long drainage path of the soil inside the bucket foundation, the pore-water pressure dissipates more slowly compared with the soil outside the bucket at the same depth. Moreover, the liquefaction resistance decreased with an increase in the aspect ratio of the bucket. The excess pore-pressure ratio under the bucket reached a minimal value near the bottom of the bucket foundation along the embedment depth. The study results can serve as a design basis for bucket foundation in seismic areas. © 2021, Editorial Board of Journal of Tianjin University(Science and Technology). All right reserved.
引用
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页码：790 / 798
页数：8
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