海底管道的垂向屈曲研究

发布时间：2018-03-20 22:01

本文选题：海底管道　切入点：整体垂向屈曲　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：在世界范围内,石油与天然气资源(简称“油气资源”)既是主要的优质资源,又是保障一个国家政治、经济、军事安全的重要战略储备物资,备受各国关注。随着海洋石油工程高温高压海底管道的普遍应用,管道安全性问题受到人们更多的关注。本文以渤海某管道为例研究了高温埋设管道的垂向屈曲规律及其影响因素,总结了控制屈曲的工程保护措施并对比其有效性。研究内容如下：首先,论文系统总结了管道整体垂向屈曲的研究现状和理论研究进展,类比结构力学中压杆的第一、二类经典失稳形式,分析了理想埋设管道和具有初始缺陷管道的屈曲规律,给出了初始几何缺陷幅值和波长的计算方法,应用理论解析计算得到工程实例中管道的屈曲极限温差与安全温差。其次,对海底高温管道屈曲问题进行数值模拟。利用特征构造法引入初始几何缺陷,建立管土接触的有限元模型,使用Riks非线性屈曲分析方法计算不同初始缺陷幅值模型的温差、位移、应力及应变,横向对比得出缺陷管道的屈曲规律。定量性得出其屈曲安全温差,与理论结果和实验结果进行对比,以验证数值模拟的正确性。最后,由管道材质、管道截面的几何尺寸、初始几何缺陷的幅值与波长、管土摩擦系数、土体重塑强度、容重以及输送压力等八个方面对海底高温管道模型进行非线性屈曲分析,根据屈曲极限和安全温差对比影响程度,提出了缺陷管道抵抗屈曲安全运行的方法。在工程防护部分总结了海底管道常用的几种保护措施,分别对挖沟后自然回填、工程回填和连锁稳定压块的保护方法进行数值分析,得到屈曲安全温差和极限温差,为工程实际应用提供量化标准,并横向对比三种防护措施的有效性。
[Abstract]:In the world, oil and gas resources (referred to as "oil and gas resources") are not only the main high-quality resources, but also an important strategic reserve material to ensure the political, economic and military security of a country. With the widespread application of high temperature and high pressure submarine pipelines in offshore oil engineering, People pay more attention to the safety of pipeline. Taking a pipeline in Bohai Sea as an example, the vertical buckling law of buried pipeline at high temperature and its influencing factors are studied in this paper. The engineering protection measures to control buckling are summarized and compared with their effectiveness. The research contents are as follows:. Firstly, this paper systematically summarizes the research status and the theoretical progress of the vertical buckling of the whole pipeline, and compares the first and second classical buckling forms of the compression bar in structural mechanics. The buckling law of ideal buried pipeline and pipeline with initial defect is analyzed, the calculation method of initial geometric defect amplitude and wavelength is given, and the limit temperature difference and safe temperature difference of pipeline in engineering example are obtained by theoretical analysis. Secondly, the buckling problem of submarine high temperature pipeline is numerically simulated, and the finite element model of pipe and soil contact is established by introducing initial geometric defects into the characteristic structure method. The temperature difference, displacement, stress and strain of different initial defect amplitude models are calculated by using Riks nonlinear buckling analysis method. In order to verify the correctness of the numerical simulation, the results are compared with the theoretical and experimental results. Finally, the material of the pipe, the geometric size of the section, the amplitude and wavelength of the initial geometric defect, the friction coefficient of the pipe and soil, the strength of the soil, The nonlinear buckling analysis of submarine high temperature pipeline model is carried out in eight aspects, such as bulk density and transportation pressure. According to the influence degree of buckling limit and safety temperature difference, The methods of safe operation of defected pipeline against buckling are put forward. In the part of engineering protection, several kinds of protection measures are summarized, and the protection methods of natural backfill, engineering backfill and interlocking stable block after trench excavation are analyzed numerically respectively. The buckling safety temperature difference and the limit temperature difference are obtained, which provides a quantitative standard for practical engineering application, and compares the effectiveness of the three protective measures horizontally.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE973

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