本文選題：海底管道　切入點：整體垂向屈曲　出處：《西南石油大學》2015年碩士論文　論文類型：學位論文

【摘要】：在世界范圍內,石油與天然氣資源(簡稱“油氣資源”)既是主要的優(yōu)質資源,又是保障一個國家政治、經濟、軍事安全的重要戰(zhàn)略儲備物資,備受各國關注。隨著海洋石油工程高溫高壓海底管道的普遍應用,管道安全性問題受到人們更多的關注。本文以渤海某管道為例研究了高溫埋設管道的垂向屈曲規(guī)律及其影響因素,總結了控制屈曲的工程保護措施并對比其有效性。研究內容如下： 首先,論文系統總結了管道整體垂向屈曲的研究現狀和理論研究進展,類比結構力學中壓桿的第一、二類經典失穩(wěn)形式,分析了理想埋設管道和具有初始缺陷管道的屈曲規(guī)律,給出了初始幾何缺陷幅值和波長的計算方法,應用理論解析計算得到工程實例中管道的屈曲極限溫差與安全溫差。 其次,對海底高溫管道屈曲問題進行數值模擬。利用特征構造法引入初始幾何缺陷,建立管土接觸的有限元模型,使用Riks非線性屈曲分析方法計算不同初始缺陷幅值模型的溫差、位移、應力及應變,橫向對比得出缺陷管道的屈曲規(guī)律。定量性得出其屈曲安全溫差,與理論結果和實驗結果進行對比,以驗證數值模擬的正確性。 最后,由管道材質、管道截面的幾何尺寸、初始幾何缺陷的幅值與波長、管土摩擦系數、土體重塑強度、容重以及輸送壓力等八個方面對海底高溫管道模型進行非線性屈曲分析,根據屈曲極限和安全溫差對比影響程度,提出了缺陷管道抵抗屈曲安全運行的方法。在工程防護部分總結了海底管道常用的幾種保護措施,分別對挖溝后自然回填、工程回填和連鎖穩(wěn)定壓塊的保護方法進行數值分析,得到屈曲安全溫差和極限溫差,為工程實際應用提供量化標準,并橫向對比三種防護措施的有效性。
[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.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE973

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本文編號：1640970