Bearing performance of a novel caisson-plate gravity anchor

Shengjie Rui, Lizhong Wang, Zefeng Zhou, H. Jostad, Zhen Guo
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Abstract

To provide a more reliable shared anchor for floating wind farms, a novel caisson-plate gravity anchor (CGA) is proposed. This design merges the benefits of both gravity anchors and suction caissons. Centrifuge model tests adopting only half of each anchor were carried out to study their bearing performance in sand. Additionally, particle image velocimetry (PIV) analyses were performed to monitor anchor movement and soil displacement. As supplementary data, numerical simulations with an advanced hypoplasticity model were also conducted to reveal the anchor capacity mobilisation mechanism. Findings indicate that the novel CGA possesses a significantly higher bearing capacity compared to standalone caisson or plate designs. By adding a plate above the caisson and increasing its weight, the anchor failure modes may shift from forward rotation to translational movement. Additionally, this adjustment may transition the brittle failure to a more reliable ductile failure. This augmented capacity of the CGA stems from the expanded soil mobilisation region and increased soil stress level in front of the caisson. The proposed CGA provides a promising solution for shared anchors in floating wind farms.
新型沉箱板式重力锚的承载性能
为了给浮动风电场提供更可靠的共用锚,我们提出了一种新型沉箱板重力锚(CGA)。这种设计融合了重力锚和吸力沉箱的优点。离心机模型试验只采用了每种锚的一半,以研究它们在沙中的承载性能。此外,还进行了粒子图像测速(PIV)分析,以监测锚杆移动和土壤位移。作为补充数据,还利用先进的低塑性模型进行了数值模拟,以揭示锚杆承载力的调动机制。研究结果表明,与独立的沉箱或平板设计相比,新型 CGA 具有更高的承载能力。通过在沉箱上方添加一块板并增加其重量,锚杆的失效模式可能会从向前旋转转变为平移运动。此外,这种调整还可将脆性破坏转变为更可靠的延性破坏。CGA 的这种增强能力源于沉箱前方土壤移动区域的扩大和土壤应力水平的提高。所提出的 CGA 为浮动风电场中的共用锚提供了一种前景广阔的解决方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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