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Visualisation of mechanisms governing suction bucket installation in dense sand
Published in Andrew McNamara, Sam Divall, Richard Goodey, Neil Taylor, Sarah Stallebrass, Jignasha Panchal, Physical Modelling in Geotechnics, 2018
R. Ragni, B. Bienen, S.A. Stanier, M.J. Cassidy, C.D. O’Loughlin
The suction bucket technology is nowadays regarded with interest for the foundations of offshore wind farms (Houlsby et al. 2005, Houlsby 2016), in relatively shallow waters. Associated with this application are more varied and coarser grained seabeds, requiring much stubbier suction buckets, and very different loading conditions when compared with traditional oil and gas applications (Tjelta 2015).
Integrated floating method based on four-bucket jacket foundation for offshore substations and converter stations
Published in Ships and Offshore Structures, 2023
Yaohua Guo, Yue Zhao, Shengxiao Zhao, Haijun Wang, Jijian Lian
The auxiliary floating self-installation platforms mostly utilise suction bucket foundations and large-scale barges to float the platform and foundation structure to the site as a whole (Figure 21). Currently, the suction bucket foundation is generally closely attached to the platform bottom through a self-lifting system and is kept on both sides of the barge (F3-FA 2019; SPT Offshore 2019). The self-floating stability of the suction bucket foundation can thus be fully utilised, and the channel depth requirements can be reduced. Once the integrated structure is transported to the site, the suction bucket descends along the column and is inserted into seabed. When stabilised, the platform is lifted to the set position by a lifting system. These two offshore oil and gas platforms have advantages of integrated floating and rapid installation, and there is no residual decommissioning recovery. As such, they are valuable for the development of cost-effective and rapid floating installation technology for offshore wind farm substation/converter station supporting structures.
Effect of partial drainage on the pullout behaviour of a suction bucket foundation
Published in European Journal of Environmental and Civil Engineering, 2022
Kanmin Shen, Youhu Zhang, Kuanjun Wang, Bin Wang, Xueliang Zhao
Suction buckets with various geometries, including suction anchors and caissons, are being used increasingly for offshore floating and fixed structures (Andersen et al., 2005; Tjelta, 2015; Randolph and Gourvenec, 2011, Fu et al., 2020), the advantages being large bearing capacity and efficient installation and retrieval (Wang et al., 2018; Shen et al., 2018; Guo et al., 2016). Offshore wind power has developed rapidly in China in the past 10 years, and recently the trend has been to apply wind turbines of larger capacity in deeper water. As shown in Figure 1, two types of suction bucket are used to support offshore wind turbines, namely a mono-bucket foundation and a suction-bucket-supported jacket foundation (typically with three or four legs). The lateral wind force acting on the hub height leads to an enormous overturning moment acting on the foundation (Byrne and Houlsby, 2003). In China, hybrid mono-buckets are used as offshore wind turbine foundations by increasing the diameter and adding self-weight (Zhang et al., 2015; He et al., 2017). The jacket foundations are used to support wind turbines with larger capacity in deeper water (Byrne & Houlsby, 2006), changing the failure mode from overturning to “push–pull”. It is found in the centrifuge tests in Kim et al. (2014) that the responses in rotation angle is much smaller for the tripod bucket foundation compared to the monopod foundation with a reasonable engineering design for OWTs. Therefore, the foundation design in the ultimate limit state is often dominated by the pullout behaviour of the single suction bucket.
Stability analysis of suction bucket foundations under wave cyclic loading and scouring
Published in Marine Georesources & Geotechnology, 2018
Xuguang Chen, Tao Liu, Yuke Jiang, Hongjun Liu, Hailei Kou, Jianpeng Xu, Xixi Liu, Jinzhong Liu, Tianchi Ma, Tao Feng, Xiaodong Niu
As the supply of and demand for energy changes around the world, new capacity is increasingly being sought in the development of wind energy. Offshore wind energy has many advantages (Song and Liu 2006) such as high wind speed, low turbulence, high yield, and the like. As a result, the successful development and utilization of offshore wind energy is highly valued by many countries. In general, the wind speed present 10 km offshore is about 25% higher than it is on coastal land (Li and Yu 2004; The British Wind Energy Association (BWEA) 2000). Related research shows that the successful development of generation infrastructure, such as turbine foundations, is a key technology in the increased usage and efficiency of offshore wind power (Jiang 2011). The foundation of offshore wind turbines is usually based on a single pile, jacket type foundation, tripod, gravity foundation, suction foundation, or floating platform structure (Xing, Chen, and Yao 2005). The suction bucket foundation has been successfully applied in a variety of offshore structures due to its ease of installation, reusability, and low material cost. It is typically used to moor an offshore floating structure or as a foundation for oil and gas platforms (Kwang et al. 2010). In recent years, engineers have successfully utilized the suction foundation in offshore wind power applications (Byrne, Houlsby, and Martin 2002), which has been a significant contribution to the development of offshore wind power projects.