海洋非金属管道在位稳性数值模拟及可靠性设计

发布时间：2018-06-10 09:50

本文选题：非金属管道 + 水动力载荷　；参考：《浙江大学》2015年硕士论文

【摘要】：相比于钢管,非金属管道具有优良的耐腐蚀性和柔韧性,极大的降低了海洋平台输油管道铺设成本,缩短管道施工周期的同时还可以保证油气产品质量,成为海上油气运输管道的新选择。作为海洋油气开发的生命线工程,从经济和环境因素考虑必须保证管道在恶劣环境下的安全。对于直接搁置在海床上的非金属管道,由于重量轻,管道在位稳性问题显得尤为重要。当管道自身重量不足以保持其在位稳性时必须考虑附加配重的方式,一个合适的分析方法对非金属管道附加配重的确定具有重大意义。本文主要研究海洋管道在波流水动力载荷作用下的在位稳性,从水动力载荷计算、管土相互作用模拟及水动力载荷和管土作用之间的耦合影响三个方面考虑整体建模。目的在于建立一个海底稳性整体分析计算模型,具体的研究方法包括： (1)利用FORTRAN语言编写JONSWAP波谱海平面运动方程,估算管道处波浪运动,利用UWAVE子程序与ABAQUS主程序衔接并通过ABAQUS/AQUA模块施加水动力载荷。 (2)分别从管土相互作用近似公式模型和理论弹塑性本构模型出发,利用FORTRAN语言编写管道-海床接触对摩擦FRIC子程序和自定义管土接触单元UEL子程序。 (3)利用ABAQUS数值模拟软件导入水动力模型及管土相互作用模型子程序,考虑管道自身的结构运动更新水动力模型及管土模型子程序,对管道整体结构进行动态分析。 (4)考虑整体模型中参数的不确定性因素,对管道在位稳性进行响应面可靠性设计,基于目标安全水平确定最优配重。
[Abstract]:Compared with steel pipes, non-metallic pipelines have excellent corrosion resistance and flexibility, greatly reducing the laying cost of oil pipelines on offshore platforms, shortening the construction period of pipelines, and ensuring the quality of oil and gas products at the same time. As a lifeline project for offshore oil and gas development, it is necessary to ensure the safety of the pipeline under the adverse environment considering the economic and environmental factors. For the non-metallic pipeline which is placed directly on the seabed, the problem of pipeline stability is very important because of its light weight. When the weight of the pipe itself is not sufficient to maintain its stability in the position, the mode of additional weight must be considered. A suitable analytical method is of great significance for determining the additional weight of non-metallic pipelines. In this paper, the in-situ stability of offshore pipelines under the action of wave-current hydrodynamic loads is studied, and the hydrodynamic loads are calculated. The whole modeling is considered in three aspects: pipe-soil interaction simulation and coupling effect between hydrodynamic load and pipe-soil interaction. The purpose of this paper is to establish a global analysis and calculation model of submarine stability. The specific research methods include: 1) compiling the equation of sea level motion of JONSWAP spectrum using FORTRAN language to estimate the wave motion in the pipeline. Using UWAVE subprogram and Abaqus main program, and applying hydrodynamic load through Abaqus / AQUA module. (2) starting from the approximate formula model of pipe-soil interaction and the theoretical elastic-plastic constitutive model, respectively. The FRIC subprogram of pipe-seabed contact to friction and the subroutine of self-defined tube-soil contact unit UEL are compiled by FORTRAN language. The subprograms of hydrodynamic model and pipe-soil interaction model are introduced by Abaqus numerical simulation software. Considering the hydrodynamic model of pipeline itself and the subroutine of pipe-soil model, the dynamic analysis of the whole structure of pipeline is carried out. (4) considering the uncertain factors of parameters in the whole model, the reliability of response surface is designed for the in-situ stability of pipeline. The optimal counterweight is determined based on the target safety level.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE973

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