考虑桩基错动的深水张力腿平台动力响应研究

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摘要由于地震、断层、滑坡和沉降等原因，张力腿平台(TLP)下端的桩基可能发生错动。考虑平台本体有限位移、六自由度运动耦合、瞬时位置和瞬时湿表面、自由表面效应等非线性因素，建立TLP系统的耦合动力学方程。采用变步长龙格库塔算法编写了数值计算程序，得到了波浪作用下平台本体六个自由度运动响应和系泊张力响应。通过文献对比，验证了理论模型和计算程序的正确性。基于南海流花油田一年一遇的设计工况，计算得到桩基下沉0.1米时16个工况下平台系统的动力响应的时间历程。以正常工况为基准，对比了不同工况中平台本体六个自由度运动、系泊张力的幅值和标准差，研究结果表明：桩基下沉对平台的六自由度响应和张力腿张力幅值产生明显的影响，但不加剧运动响应和张力响应的波动；桩基下沉会破坏平台系统原有的对称性，引起垂荡位移的较大恶化；桩基下沉会引起张力腿张力大幅增大，存在张力腿断裂和系泊失效的风险。

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关键词 ：张力腿平台, 桩基错动, 耦合模型, 动力响应, 系泊失效

Abstract：Due to earthquakes, faults, landslides and settlements, the leg foundation under a tension leg platform (TLP) may move. Based on the once-a-year design condition of Liuhua Oilfield in the South China Sea, the time history of the dynamic response of the platform system under 16 cases with the foundation moves down 0.1 meters is calculated. The amplitude and standard deviation of the six DOFs motion as well as the mooring tension in different cases were compared. The results show that the foundational movements have significant impacts on the amplitude of the six DOFs response and tension leg tension, but do not aggravate the fluctuations of these responses; the foundational movements will destroy the original symmetry of the platform system and lead to a greater deterioration in the heave motion; the foundational movements will increase leg tensions significantly and there is a risk of tension leg breakage and mooring failure.

Key words： tension leg platform foundational movement coupled model dynamic response mooring failure

收稿日期: 2021-08-25 出版日期: 2023-03-15

引用本文:

余杨1,2，张晓铭1,2，李振眠1,2，周俊龙3, 成司元1,2，崔宇朋1,2，余建星1,2，杨政龙1,2. 考虑桩基错动的深水张力腿平台动力响应研究[J]. 振动与冲击, 2023, 42(5): 39-46.
YU Yang1,2, ZHANG Xiaoming1,2, LI Zhenmian1,2, ZHOU Junlong3, CHENG Siyuan1,2, YU Jianxing1,2, YANG Zhenglong1,2. Dynamic response of deep-water TLP considering pile foundation dislocation. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(5): 39-46.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I5/39

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