Dynamic response of deep-water TLP considering pile foundation dislocation

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (5) : 39-46.

YU Yang1,2, ZHANG Xiaoming1,2, LI Zhenmian1,2, ZHOU Junlong3, CHENG Siyuan1,2, YU Jianxing1,2, YANG Zhenglong1,2

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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

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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[J]. Journal of Vibration and Shock, 2023, 42(5): 39-46

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