砂土海床中拖曳锚–锚链一体化大变形有限元贯入分析  

LARGE DEFORMATION FINITE ELEMENT ANALYSIS ON THE INSTALLATION OF INTEGRATED DRAG ANCHOR-CHAIN SYSTEM IN SANDY SEABED

作　　者：李书兆 李辉 易丛 郭鹏 吴初恒 张友虎 LI Shuzhao;LI Hui;YI Cong;GUO Peng;WU Chuheng;ZHANG Youhu(CNOOC Research Institute,Beijing 100028,China;School of Civil Engineering,Southeast University,Nanjing 211100,China)

机构地区：[1]中海油研究总院有限责任公司,北京100028 [2]东南大学土木工程学院,南京211100

出　　处：《力学与实践》2024年第6期1192-1200,共9页Mechanics in Engineering

基　　金：国家自然科学基金项目(52109117);中央高校基本科研业务费专项资金资助。

摘　　要：海上风电设施正经历由近海到深远海,由固定式到漂浮式的发展过程。拖曳锚作为一种成本低,承载效率高的系泊基础,在漂浮式海工结构的系泊中应用广泛。对于拖曳锚在砂土中的安装贯入轨迹,目前还没有成熟的设计方法。本文提出了一种基于耦合欧拉-拉格朗日法(coupled Eulerian-Lagrangian,CEL)的大变形有限元分析方法,通过对锚链的几何形态进行了合理简化并采用合适的锚链连接器,建立了拖曳锚-锚链的一体化大变形贯入过程有限元分析模型。通过与物理模型试验的结果对比表明,本文提出的拖曳锚-锚链一体化大变形有限元分析方法表现出较好的可靠性与准确性,为深入研究砂土中拖曳锚贯入行为提供了有力工具。The offshore wind industry is expanding from shallow waters to deep waters and from bottom-fixed to floating wind turbines.As a cost effective and efficient type of anchoring foundations,drag anchors have been widely used for mooring floating offshore structures.However,there is currently no well-established calculation method for predicting the installation trajectory of drag anchors in sand.This paper proposes a large deformation finite element analysis approach based on coupled Eulerian Lagrangian(CEL) method.By simplifying the chain geometry and use of appropriate connectors between chain links,an integrated drag anchor-chain model is established.The results of the large deformation finite element analyses are compared with those of physical model experiments.The comparison demonstrates good accuracy and reliability of the numerical model.The large deformation analysis approach proposed in this paper provides a powerful tool for further investigation on drag anchor installation behaviour in sand.

关 键 词：拖曳锚 耦合欧拉-拉格朗日法 大变形有限元分析 贯入轨迹 砂土 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]