海上浮式可再生能源系统锚杆全寿命响应的宏观数值模拟

K. Kwa, N. Sivasithamparam, A. Deeks, D. White
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引用次数: 2

摘要

海上可再生能源(ORE)行业正在开发新的解决方案,使浮动设施能够远离海岸,在那里可以获得更多的海洋空间,并可以利用更强的风力资源。未来的ORE设施将包括一系列设备,这些设备将通过系泊和锚定系统连接并将载荷传输到海底。因此,对锚泊系统能够承受通过系泊线传递的各种载荷的能力进行可靠的估计是至关重要的。本文为软土(即软粘土、松散-中等泥沙和砂土)提供了一个模型,由于持续荷载和循环荷载的可变分量,其承载力会随着时间的推移而变化,而循环荷载的变化则取决于环境条件和浮动系统的特征。该模型被称为“宏观模型”,这意味着锚周围所有土元素的响应由单个节点的强度和其他属性的代表性值定义。该模型捕获了以下因素的“隐藏”锚碇能力增强:(i)“全寿命”变化的土壤强度,(ii)粘性对土壤强度的影响,以及(iii)附加的土壤质量效应,这些通常在岩土基础设计中是不存在的。研究表明,这些影响可以有效地建模并集成到现有的数值分析软件包中,为评估岩土锚杆能力的全寿命变化提供了新的基础。这可以更好地理解浮式基础设施在其使用寿命期间的完全耦合的土-锚-系泊行为。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Numerical Macro Model to Simulate the Whole Life Response of Anchors for Floating Offshore Renewable Energy Systems
The offshore renewable energy (ORE) industry is developing new solutions to enable floating facilities that can operate further from shore where more ocean space is available and stronger wind resources can be harnessed. Future ORE facilities will involve arrays of devices that connect and will transmit loads to the seafloor via mooring and anchoring systems. Therefore, it is essential to have a reliable estimation of the capacity that the anchoring system can provide for the variety of loads that are transmitted via the mooring lines. This paper provides a model for soft soils (i.e. soft clays, loose-medium silts and sand), where the capacity can evolve with time due to the sustained loads and variable components of the cyclic loads, which vary due to environmental conditions and the characteristics of the floating system. The model is referred to as a ‘macro-model’, meaning that the response of all soil elements around the anchor are defined by a representative value of strength and other properties at a single node. The model captures ‘hidden’ anchor capacity enhancements from (i) ‘whole-life’ changing soil strength, (ii) viscous effects on soil strength and (iii) added soil mass effects, which are usually absent in geotechnical foundation design. It is shown that these effects can be efficiently modelled and integrated into existing numerical analysis packages to provide a new basis for assessing through-life changes in geotechnical anchor capacity. This enables a better understanding of the fully coupled soil-anchoring-mooring behaviour of floating infrastructure over its operational lifetime.
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