深海水下生产系统防沉板基础形式改进研究

发布时间：2018-01-04 22:05

本文关键词：深海水下生产系统防沉板基础形式改进研究　出处：《天津大学》2016年硕士论文　论文类型：学位论文

【摘要】：防沉板是水下生产系统的重要基础形式,在海洋工程开发中有着广泛应用。基础承载能力不仅决定防沉板的适用范围,还关乎水下生产系统的稳定性与安全性。随着人类对海洋的开发逐渐由近海迈向深海,在选取防沉板作为深海水下生产系统的基础形式时,对防沉板承载能力的要求也逐渐提高。本文针对现有防沉板基础承载能力不足的问题,提出防沉板结构形式改进的方案,以拓宽防沉板在深海领域的运用范围。本文运用有限元软件ABAQUS,对防沉板在复合加载模式下的极限承载力、下部结构的贯入过程进行了有限元分析。通过建立防沉板与土体的相互作用模型,通过平衡初始地应力,设置主-从接触,施加重力荷载与位移约束,用Swipe法对不同结构形式防沉板进行数值模拟。比较分析多种防沉板在复合加载模式下的极限复合承载能力差异,讨论了单轴竖向承载力、V-H、H-M荷载空间破坏包络线。计算结果显示,防沉板是否有底部结构、底部结构的形式、布置以及深度对荷载位移曲线以及破坏包络线有着显著的影响。通过CEL方法对防沉板下部结构贯入过程进行了数值模拟,比较分析不同结构防沉板贯入至目标深度所受到的阻力和需要的外部驱动因素,指出贯入过程中的土体隆起是阻碍防沉板贯入的重要因素,改进下部结构必须考虑结构形式和布置与土体隆起之间的关系,为改进下部结构后的防沉板的安装过程和贯入可行性分析提供参考。本文对水下生产系统防沉板基础的安装方法进行了论述,通过对不同方法的介绍,为防沉板设计、制造以及安装阶段中考虑到贯入过程时选用不同的分析方法提供了实际工程依据。本文提出了通过改进防沉板结构形式以克服承载力不足的问题的建议,结合改进防沉板结构后在安装过程中可能出现的问题进行了贯入过程模拟,综合考虑多方面因素,提出改进防沉板结构的构想,为拓宽防沉板的运用领域提供了参考。
[Abstract]:Anti-sinking plate is an important basic form of underwater production system, which is widely used in marine engineering development. The bearing capacity of foundation not only determines the applicable scope of anti-sinking plate. It also relates to the stability and safety of underwater production system. With the development of the ocean gradually from the offshore to the deep sea, when selecting anti-sinking board as the basic form of deep-sea underwater production system. The requirement of bearing capacity of anti-sinking plate is also increasing gradually. Aiming at the problem of insufficient bearing capacity of existing foundation of anti-sinking plate, this paper puts forward a scheme to improve the structural form of anti-sinking plate. In order to widen the scope of application of anti-sinking plate in the field of deep-sea, this paper uses the finite element software Abaqus, to the ultimate bearing capacity of anti-sinking plate under the composite loading mode. Finite element analysis is carried out on the penetration process of the substructure. By establishing the interaction model between the anti-settlement plate and the soil, the initial in-situ stress is balanced, the principal and slave contact is set, and the constraints of gravity load and displacement are imposed. The numerical simulation of anti-sinking plates with different structural forms is carried out by using Swipe method. The difference of ultimate composite load-carrying capacity of various anti-sinking plates under composite loading mode is compared and analyzed, and the uniaxial vertical bearing capacity (V-H) is discussed. The calculation results show whether the anti-sinking plate has the bottom structure and the form of the bottom structure. The layout and depth have a significant influence on the load displacement curve and the failure envelope. The penetration process of the substructure of the anti-sinking plate is simulated by CEL method. By comparing and analyzing the resistance and external driving factors of different structures from penetration to target depth, it is pointed out that the soil uplift in the penetration process is an important factor that hinders the penetration of the anti-sinking plate. In order to improve the substructure, the relationship between the form and arrangement of the structure and the uplift of the soil must be considered. In order to improve the installation process of substructure anti-sinking plate and the feasibility analysis of penetration, this paper discusses the installation method of anti-sinking plate foundation of underwater production system, through the introduction of different methods. Designed for anti-sinking board. In the process of manufacture and installation, different analysis methods are used to provide practical engineering basis. This paper puts forward some suggestions on how to overcome the problem of insufficient bearing capacity by improving the structure form of anti-settlement plate. Combined with the problems that may appear in the installation process after improving the anti-sinking plate structure, the paper simulates the penetration process, synthetically considers many factors, and puts forward the idea of improving the anti-sinking plate structure. It provides a reference for widening the application field of anti-sinking board.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P751

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