垂直加载锚在层状粘土中拖曳埋设时的运动特性

IF 3.9 4区 工程技术 Q1 ENGINEERING, MARINE Brodogradnja Pub Date : 2023-04-01 DOI:10.21278/brod74206
Bin Wang, Yuqi Jiao, D. Qiao, Shan Gao, Tianfei Li, J. Ou
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引用次数: 0

摘要

作为一种广泛应用于深水平台的张紧绳系泊系统,垂直加载锚(VLA)在承载能力、角度适应性和深水安装方面比其他系统具有更好的性能。然而,VLA的安装过程及其运动特性受到多层海底土壤的显著影响。本文采用耦合欧拉-拉格朗日(CEL)大变形有限元分析方法,分析了VLA在具有夹层刚性层的非均匀粘土中的连续渗透。对不同嵌入深度、厚度和刚性层不排水抗剪强度的层状粘土中VLA的轨迹、阻力角、运动方向和阻力进行了详细的参数研究。通过与悬链线反方程的解析解的比较,验证了CEL数值分析结果。CEL分析的结果与分析溶液之间取得了极好的一致性。在运动方向角和阻力的趋势线上,刚性层分别导致凹形和凸形。刚性层的嵌入深度决定了凹凸形状在趋势线上出现的位置,而厚度影响形状开口的大小。最具决定性的参数,不排水抗剪强度的突然变化,导致层状粘土界面的主要旋转。它降低了最终埋置深度和最终稳定阻力,这意味着VLA在层状粘土中的承载力严重下降。
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Motion characteristics of vertically loaded anchor during drag embedment in layered clay
As a widely used taut-wire mooring system for deepwater platforms, the Vertically Loaded Anchor (VLA) has better performance in bearing capacity, angle adaptability, and deepwater installation than other systems. However, the installation process of the VLA and its motion characteristics are significantly impacted by multi-layered seabed soil. In this paper, the coupled Eulerian‒Lagrangian (CEL) large deformation finite element analysis method has been applied to analyse the continuous penetration of a VLA in nonuniform clay with an interbedded stiff layer. A detailed parametric study has been carried out to explore the trajectory, drag angle, movement direction and drag force of the VLA in layered clay with different embedded depths, thicknesses and undrained shear strength of the stiff layer. The CEL numerical analysis results have been validated by comparison with the analytical solutions from the inverse catenary equation. Excellent agreement has been obtained between the results from the CEL analyses and the analytical solutions. The stiff layer leads to concave and convex shapes on the trend lines of the movement direction angle and drag forces, respectively. The embedded depth of the stiff layer determines where the concave and convex shapes appear on the trend lines, while the thickness affects the sizes of the openings of the shapes. The most decisive parameter, an abrupt variation in the undrained shear strength, causes predominant rotation at the interface of layered clay. It diminishes the final embedment depth and ultimate stable drag force, meaning that the bearing capacity of the VLA severely declined in layered clay.
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来源期刊
Brodogradnja
Brodogradnja ENGINEERING, MARINE-
CiteScore
4.30
自引率
38.90%
发文量
33
审稿时长
>12 weeks
期刊介绍: The journal is devoted to multidisciplinary researches in the fields of theoretical and experimental naval architecture and oceanology as well as to challenging problems in shipbuilding as well shipping, offshore and related shipbuilding industries worldwide. The aim of the journal is to integrate technical interests in shipbuilding, ocean engineering, sea and ocean shipping, inland navigation and intermodal transportation as well as environmental issues, overall safety, objects for wind, marine and hydrokinetic renewable energy production and sustainable transportation development at seas, oceans and inland waterways in relations to shipbuilding and naval architecture. The journal focuses on hydrodynamics, structures, reliability, materials, construction, design, optimization, production engineering, building and organization of building, project management, repair and maintenance planning, information systems in shipyards, quality assurance as well as outfitting, powering, autonomous marine vehicles, power plants and equipment onboard. Brodogradnja publishes original scientific papers, review papers, preliminary communications and important professional papers relevant in engineering and technology.
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