【摘要】：鋼懸鏈?zhǔn)搅⒐埽⊿CR）是一種新型深水立管系統(tǒng)，是浮式平臺輸入輸出的首選立管系統(tǒng)。鋼懸鏈?zhǔn)搅⒐芗５坠芫�與立管與一身，一端連接海底井口，一端通過柔性接頭連接浮式結(jié)構(gòu)。鋼懸鏈?zhǔn)搅⒐芘c海床剛接觸的區(qū)域稱為觸地點區(qū)域，，觸地點區(qū)域是鋼懸鏈?zhǔn)搅⒐芷诜治龅闹攸c位置。鋼懸鏈?zhǔn)搅⒐芘c海床相互作用過程非常復(fù)雜，對立管的動力響應(yīng)和疲勞壽命有較大的影響。研究結(jié)果表明疲勞壽命的評估與選用的海床土的剛度有關(guān)。因此為了能夠準(zhǔn)確的評估立管觸地點處的疲勞壽命，需要采用合理的海床模型。 在本文中，選用根據(jù)之前的實驗結(jié)果和數(shù)值模擬得到的非線性p-y曲線來模擬鋼懸鏈?zhǔn)搅⒐芘c海床土的相互作用。p-y曲線中p代表海床土的支撐力而y代表立管貫入海床土的深度。本文改編基于大撓度柔性梁理論的錨線和立管的動力分析程序CABLE3D，從而使該程序?qū)α⒐芘c海床土相互作用的模擬是遵循本文采用的p-y曲線。 隨后利用改編后的程序分別研究了不同海床土強度和不同垂蕩幅值情況下立管的動態(tài)響應(yīng)及疲勞。結(jié)果表明，在非線性管土相互作用分析過程中，觸地點區(qū)域的節(jié)點會經(jīng)歷不同的管土相互作用過程。隨著上部結(jié)構(gòu)的運動幅值增加與海床土的強度的增大，立管的最大貫入深度也會相應(yīng)的增加和減小。立管最大彎矩值和最大應(yīng)力值主要受到上部結(jié)構(gòu)運動幅值的影響，隨著上部結(jié)構(gòu)的運動幅值增大，立管的最大彎矩、應(yīng)力值也會隨之增大。隨著海床土強度的增大和上部結(jié)構(gòu)運動幅值的增大，在觸底點區(qū)域的彎矩變化幅度也相應(yīng)增大，從而影響了疲勞損傷率，即隨著海床土強度和上部結(jié)構(gòu)運動幅值的增大，立管在觸底點區(qū)域最大年疲勞損傷率也會明顯增大。
[Abstract]:Steel chain riser (SCR) is a new type of deep water riser system, which is the preferred riser system for floating platform input and output. The steel chain riser is a combination of submarine pipeline and riser, one end is connected to the bottom well head, one end is connected with floating structure by flexible joint. The area where the steel chain riser is in contact with the seabed is called the contact site, and the contact area is the key point of fatigue analysis of the steel chain riser. The interaction process between steel chain riser and seabed is very complicated, which has great influence on dynamic response and fatigue life of steel chain riser. The results show that the evaluation of fatigue life is related to the stiffness of the selected seabed soil. Therefore, in order to accurately evaluate the fatigue life of the riser at the contact site, it is necessary to adopt a reasonable seabed model. In this paper, the nonlinear p-y curves based on the previous experimental results and numerical simulations are used to simulate the interaction between steel chain risers and seabed soil. The p y curve represents the supporting force of the seabed soil and y represents the depth of the vertical pipe penetrating into the seabed soil. In this paper, the dynamic analysis program CABLE3D, of anchor line and riser based on the theory of large deflection flexible beam is adapted to make the simulation of interaction between pipe and seabed soil follow the p-y curve used in this paper. Then the dynamic response and fatigue of riser under different seabed soil strength and different swaying amplitude were studied by using the adapted program. The results show that, in the nonlinear analysis of pipe-soil interaction, the joints in the contact site will undergo different processes of tube-soil interaction. With the increase of the motion amplitude of the superstructure and the strength of the seabed soil, the maximum penetration depth of the riser will increase and decrease accordingly. The maximum bending moment and maximum stress of the riser are mainly affected by the amplitude of the superstructure motion. With the increase of the motion amplitude of the superstructure, the maximum bending moment and the stress value of the riser will also increase. With the increase of the strength of the seabed soil and the amplitude of the superstructure motion, the variation of bending moment at the bottom point increases accordingly, which affects the fatigue damage rate, that is, with the increase of the strength of the seabed soil and the amplitude of the superstructure motion, The maximum annual fatigue damage rate of riser also increases at the bottom contact point.
【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P756.2

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