2014, Volume 16, Issue 8
Strategic Study of CAE >> 2014, Volume 16, Issue 8
Effects of key parameters of anchor on bearing behavior of gravity foundation with anchors for offshore wind turbines
1. PetroChina Northeast Refining & Petrochemical Engineering Co. Ltd. Jilin Design Institute，Jilin， Jilin 132000，China；
2. Shenzhen Key Laboratory of Urban and Civil Engineering for Disaster Prevention and Mitigation，Shenzhen Graduate School，Harbin Institute of Technology，Shenzhen，Guangzhou 518055， China；
3. Faculty of Engineering，China University of Geosciences，Wuhan 470000，hina
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Abstract
A novel type of offshore wind turbine foundation, which is named gravity foundation with anchors, has been proposed recently. The effects of key parameters of anchor on bearing behavior of this type of foundation were investigated in this study by carrying out the finite element analysis. It was found that increasing the number of anchors not only improves the bearing capacity of foundation but also reduces the axial force of each anchor. However, when the number of anchors is increased to certain extent, the spacing between two anchors becomes too small and then the load-carrying zones in the subsoil are overlapped, thereby causing the superposition of stress and reducing the bearing efficiency of anchors. Therefore, the number of anchors should be optimized. Regarding the effect of diameter of anchors, the analysis showed that the bearing capacity of foundation increases almost linearly with the diameter of anchors. In other words, the larger the diameter of anchors the greater contribution for the stability of foundation provided by the anchors. Therefore, the diameter of anchors should be as large as possible. It was also found that the increase in the diameter of anchor rings is equivalent to the increase in the arm of anti-moment provided by the anchors. However, ince the anchors can change equivalent stiffness of the subsoil, the bearing capacity under vertical loading increases firstly but decreases subsequently as the diameter of anchor ring increases. Consequently, it is essential to evaluate bearing capacity from various aspects and determine appropriate diameter of anchor rings for design.
Keywords
offshore wind turbine ; gravity foundation ; anchor ; three-dimensional finite element analysis
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