本文關鍵詞： 海底管線 水平向整體屈曲 缺陷引入 數(shù)值模擬　出處：《天津大學》2014年碩士論文　論文類型：學位論文

【摘要】：近年隨著全球海洋石油業(yè)的迅速發(fā)展，海底管線被廣泛應用于全球范圍的石油、天然氣開采中。為了防止石蠟堵塞管道，石油、天然氣需要在高溫、高壓條件下輸送，使得管線在溫度荷載和內(nèi)壓荷載的作用下發(fā)生整體屈曲，導致管線發(fā)生破裂，造成嚴重的環(huán)境污染與經(jīng)濟損失。目前有關海底管線變形的監(jiān)測數(shù)據(jù)較少，因此，建立一套完善的數(shù)值模擬方法具有重要的理論意義和實用價值。 本文應用ABAQUS軟件對海底管線水平向整體屈曲數(shù)值模擬方法進行了詳細論述；創(chuàng)新性的提出了海底管線水平向整體屈曲數(shù)值模擬中引入初始缺陷的方法；提出了四種有限元模擬溫度應力下海底管線水平向整體屈曲的方法，并運用這四種方法對工程算例進行了較為系統(tǒng)的分析和對比，將有限元計算結果與經(jīng)典的缺陷管線水平向屈曲解析解進行了對照；圍繞建模過程，對海底管線水平向整體屈曲影響因素進行了分析對比，通過工程實例，分析了海底管線水平向整體屈曲的多種影響因素，并將每種因素分別在其合理的范圍內(nèi)取值進行有限元計算，對每種因素參數(shù)選取的規(guī)律進行了分析；最后針對數(shù)值模擬中三個關鍵問題進行了討論。 研究表明：四種不同模擬方法得到的管線整體屈曲結果具有顯著差異。原因在于三維分析模型中考慮了管線的自沉過程以及動力方法考慮了管線變形過程中速度的影響；海底管線水平向整體屈曲受多種因素影響，部分因素影響較為顯著，主要體現(xiàn)在：溫度荷載，管線直徑，管線壁厚等，這些因素取值的變化，，對管線屈曲幅值和管線內(nèi)部應力都有較為顯著的改變；管線數(shù)值模擬中，模型邊界的選取與計算長度的選取存在密切關聯(lián)，不同的邊界條件形式對應不同的計算長度；海底管線屈曲段水平向變形的速度對整體屈曲有顯著影響，不同的水平向運動速度對應不同的水平向抗力，水平向運動速度越大整體屈曲變形越顯著。
[Abstract]:In recent years, with the rapid development of the global marine oil industry, submarine pipelines are widely used in oil and natural gas exploitation worldwide. In order to prevent paraffin blockage, oil and natural gas need to be transported under high temperature and high pressure. Under the action of temperature load and internal pressure load, the pipeline buckles as a whole, resulting in the pipeline rupture, causing serious environmental pollution and economic loss. At present, there are few monitoring data on the deformation of submarine pipeline. It is of great theoretical significance and practical value to establish a set of perfect numerical simulation methods. In this paper, the numerical simulation method of horizontal overall buckling of submarine pipeline is discussed in detail by using ABAQUS software, and the method of introducing initial defects into numerical simulation of horizontal overall buckling of submarine pipeline is proposed. In this paper, four finite element methods for simulating the horizontal buckling of submarine pipelines under temperature stress are proposed, and the engineering examples are systematically analyzed and compared by using these four methods. The results of finite element analysis are compared with the classical analytical solutions of horizontal buckling of defective pipelines, and the influencing factors of horizontal buckling of submarine pipelines are analyzed and compared around the modeling process. This paper analyzes many factors influencing the overall horizontal buckling of submarine pipeline, and calculates each factor within its reasonable range by finite element method, and analyzes the rule of selecting each factor parameter. Finally, three key problems in numerical simulation are discussed. The results show that there are significant differences in the global buckling results obtained by the four simulation methods. The reason is that the self-sinking process of the pipeline and the influence of the velocity in the deformation process of the pipeline are taken into account in the three-dimensional analysis model. The overall horizontal buckling of submarine pipeline is affected by many factors, some of which are significant, mainly reflected in: temperature load, pipeline diameter, pipeline wall thickness and so on. In the pipeline numerical simulation, the selection of the model boundary is closely related to the selection of the calculated length, and different boundary conditions correspond to different calculated lengths. The velocity of horizontal deformation in the buckling section of submarine pipeline has a significant effect on the overall buckling. Different horizontal motion velocities correspond to different horizontal resistance, and the greater the horizontal velocity, the more obvious the global buckling deformation is.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：P756.2

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