EXPERIMENTAL INVESTIGATION ON SEABED RESPONSE UNDER WAVE-INDUCED MOTION OF MARINE STRUCTURE

Ren Xingyue; Xiong Fangjie; Xie Zhuoheng; Li Bing

doi:10.19912/j.0254-0096.tynxb.2020-0518

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (3) : 87-94. DOI: 10.19912/j.0254-0096.tynxb.2020-0518

EXPERIMENTAL INVESTIGATION ON SEABED RESPONSE UNDER WAVE-INDUCED MOTION OF MARINE STRUCTURE

Ren Xingyue¹, Xiong Fangjie¹, Xie Zhuoheng², Li Bing¹

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Abstract

The oscillation of the marine structure caused by the wave action could act on the seabed in the form of cyclic load, which results in the accumulation of the excess pore water pressure in the seabed, and the liquefaction of the seabed occasionally. In order to investigate the evolution of the excess pore water pressure in the porous seabed under the action of wave-induced oscillation of the marine structure, a two-dimensional flume experiment was carried out with marine structure movement controlled by two stepping motors. Experiments by using different sand beds, structure models with different the self-weights, and structure movement with different amplitude and periods were adopted. The liquefaction characteristics of the seabed through load amplitude and period was presented by using the excess pore water pressure, which indicated that the smaller the diameter of the sandy seabed, the more obvious the accumulation of excess pore water pressure, and the self-weight of the marine structure has a significant effect on the accumulation of excess pore water pressure. Moreover, the liquefaction depth increases with increase of the movement amplitude, and decreases with the increase of the movement period. Furthermore, the amplitude of the excess pore water pressure measured at the middle of the structure is greater than that at the end area.

Key words

offshore wind power / liquefaction / pore pressure / wave-induced oscillation / seabed response

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Ren Xingyue, Xiong Fangjie, Xie Zhuoheng, Li Bing. EXPERIMENTAL INVESTIGATION ON SEABED RESPONSE UNDER WAVE-INDUCED MOTION OF MARINE STRUCTURE[J]. Acta Energiae Solaris Sinica. 2022, 43(3): 87-94 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0518

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