本文關(guān)鍵詞：深海水下生產(chǎn)系統(tǒng)防沉板基礎(chǔ)形式改進研究　出處：《天津大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 防沉板 水下生產(chǎn)系統(tǒng) 破壞包絡(luò)線 極限承載力 貫入過程 CEL方法 安裝方式

【摘要】：防沉板是水下生產(chǎn)系統(tǒng)的重要基礎(chǔ)形式,在海洋工程開發(fā)中有著廣泛應(yīng)用�；A(chǔ)承載能力不僅決定防沉板的適用范圍,還關(guān)乎水下生產(chǎn)系統(tǒng)的穩(wěn)定性與安全性。隨著人類對海洋的開發(fā)逐漸由近海邁向深海,在選取防沉板作為深海水下生產(chǎn)系統(tǒng)的基礎(chǔ)形式時,對防沉板承載能力的要求也逐漸提高。本文針對現(xiàn)有防沉板基礎(chǔ)承載能力不足的問題,提出防沉板結(jié)構(gòu)形式改進的方案,以拓寬防沉板在深海領(lǐng)域的運用范圍。本文運用有限元軟件ABAQUS,對防沉板在復(fù)合加載模式下的極限承載力、下部結(jié)構(gòu)的貫入過程進行了有限元分析。通過建立防沉板與土體的相互作用模型,通過平衡初始地應(yīng)力,設(shè)置主-從接觸,施加重力荷載與位移約束,用Swipe法對不同結(jié)構(gòu)形式防沉板進行數(shù)值模擬。比較分析多種防沉板在復(fù)合加載模式下的極限復(fù)合承載能力差異,討論了單軸豎向承載力、V-H、H-M荷載空間破壞包絡(luò)線。計算結(jié)果顯示,防沉板是否有底部結(jié)構(gòu)、底部結(jié)構(gòu)的形式、布置以及深度對荷載位移曲線以及破壞包絡(luò)線有著顯著的影響。通過CEL方法對防沉板下部結(jié)構(gòu)貫入過程進行了數(shù)值模擬,比較分析不同結(jié)構(gòu)防沉板貫入至目標(biāo)深度所受到的阻力和需要的外部驅(qū)動因素,指出貫入過程中的土體隆起是阻礙防沉板貫入的重要因素,改進下部結(jié)構(gòu)必須考慮結(jié)構(gòu)形式和布置與土體隆起之間的關(guān)系,為改進下部結(jié)構(gòu)后的防沉板的安裝過程和貫入可行性分析提供參考。本文對水下生產(chǎn)系統(tǒng)防沉板基礎(chǔ)的安裝方法進行了論述,通過對不同方法的介紹,為防沉板設(shè)計、制造以及安裝階段中考慮到貫入過程時選用不同的分析方法提供了實際工程依據(jù)。本文提出了通過改進防沉板結(jié)構(gòu)形式以克服承載力不足的問題的建議,結(jié)合改進防沉板結(jié)構(gòu)后在安裝過程中可能出現(xiàn)的問題進行了貫入過程模擬,綜合考慮多方面因素,提出改進防沉板結(jié)構(gòu)的構(gòu)想,為拓寬防沉板的運用領(lǐng)域提供了參考。
[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.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：P751

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