钢悬链式立管与海床土非线性相互作用研究
发布时间：2018-09-03 15:54
【摘要】：钢悬链式立管（SCR）是一种新型深水立管系统，是浮式平台输入输出的首选立管系统。钢悬链式立管集海底管线与立管与一身，一端连接海底井口，一端通过柔性接头连接浮式结构。钢悬链式立管与海床刚接触的区域称为触地点区域，，触地点区域是钢悬链式立管疲劳分析的重点位置。钢悬链式立管与海床相互作用过程非常复杂，对立管的动力响应和疲劳寿命有较大的影响。研究结果表明疲劳寿命的评估与选用的海床土的刚度有关。因此为了能够准确的评估立管触地点处的疲劳寿命，需要采用合理的海床模型。 在本文中，选用根据之前的实验结果和数值模拟得到的非线性p-y曲线来模拟钢悬链式立管与海床土的相互作用。p-y曲线中p代表海床土的支撑力而y代表立管贯入海床土的深度。本文改编基于大挠度柔性梁理论的锚线和立管的动力分析程序CABLE3D，从而使该程序对立管与海床土相互作用的模拟是遵循本文采用的p-y曲线。 随后利用改编后的程序分别研究了不同海床土强度和不同垂荡幅值情况下立管的动态响应及疲劳。结果表明，在非线性管土相互作用分析过程中，触地点区域的节点会经历不同的管土相互作用过程。随着上部结构的运动幅值增加与海床土的强度的增大，立管的最大贯入深度也会相应的增加和减小。立管最大弯矩值和最大应力值主要受到上部结构运动幅值的影响，随着上部结构的运动幅值增大，立管的最大弯矩、应力值也会随之增大。随着海床土强度的增大和上部结构运动幅值的增大，在触底点区域的弯矩变化幅度也相应增大，从而影响了疲劳损伤率，即随着海床土强度和上部结构运动幅值的增大，立管在触底点区域最大年疲劳损伤率也会明显增大。
[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.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P756.2
本文编号：2220453
[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.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P756.2
【参考文献】
相关期刊论文 前6条
1 黄维平;孟庆飞;白兴兰;;钢悬链式立管与海床相互作用模拟方法研究[J];工程力学;2013年02期
2 傅俊杰;杨和振;;深海钢悬链立管触地点动力响应分析[J];海洋工程;2009年02期
3 黄维平;李华军;;深水开发的新型立管系统——钢悬链线立管(SCR)[J];中国海洋大学学报(自然科学版);2006年05期
4 郭海燕;高秦岭;王小东;;钢悬链线立管与海床土体接触问题的ANSYS有限元分析[J];中国海洋大学学报(自然科学版);2009年03期
5 王坤鹏;薛鸿祥;唐文勇;;基于海床吸力和刚度衰减模型的深海钢悬链线立管动力响应分析[J];上海交通大学学报;2011年04期
6 任艳荣;;ABAQUS软件在管土相互作用中的应用[J];中国海洋平台;2007年04期
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