EXPERIMENTAL STUDY ON INSTALLATION MODEL OF SELF-SINKING/SUCTION-PENETRATION INTEGRATED OFFSHORE PHOTOVOLTAIC STRUCTURE IN LAYERED SOIL

Zhang Yukun; Lan Yichao; Li Dayong; Xiang Qian; Sun Chuanping; Yang Yifei

doi:10.19912/j.0254-0096.tynxb.2023-2060

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (4) : 280-290. DOI: 10.19912/j.0254-0096.tynxb.2023-2060

EXPERIMENTAL STUDY ON INSTALLATION MODEL OF SELF-SINKING/SUCTION-PENETRATION INTEGRATED OFFSHORE PHOTOVOLTAIC STRUCTURE IN LAYERED SOIL

Zhang Yukun¹, Lan Yichao¹, Li Dayong^1,2, Xiang Qian¹, Sun Chuanping¹, Yang Yifei¹

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Abstract

In order to enhance the efficiency of offshore photovoltaic construction and installation while minimizing time and cost, a novel “self-sinking/suction-penetration near-shore fixed photovoltaic integrated structure” was proposed. Model experiments were conducted to investigate the installation characteristics of the offshore photovoltaic integrated structure on typical layered seabed foundations in China. The experimental findings demonstrate that, at identical penetration depths, the integrated structure yields a greater soil plug height following suction penetration compared to a single suction caisson. As the integrated structure penetrates the upper clay layer and punctures the lower sand layer, the penetration effect becomes more pronounced, resulting in a 320% increase in suction force compared to the single suction caisson. Moreover, a discernible “seepage reduction” effect is observed in the sand layer. Under this effect, the integrated structure is susceptible to a “pile running” phenomenon due to the combined influence of gravity and suction. However, the “pile running” phenomenon was not observed during the single suction caisson penetration test, indicating the need to consider the “pile running” risk in the penetration process of integrated structure. A modified formula for penetration resistance and suction, accounting for the seepage resistance in layered soil, was proposed. The experimental results show that the maximum suction obtained is approximately 7.4% lower than the maximum suction calculated using the theoretical modified formula. The theoretical analysis method exhibits a high degree of agreement with the results of the model test.

Key words

offshore photovoltaic / integrated structure / layered soil / penetration resistance / penetration suction / seepage reduction effect

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Zhang Yukun, Lan Yichao, Li Dayong, Xiang Qian, Sun Chuanping, Yang Yifei. EXPERIMENTAL STUDY ON INSTALLATION MODEL OF SELF-SINKING/SUCTION-PENETRATION INTEGRATED OFFSHORE PHOTOVOLTAIC STRUCTURE IN LAYERED SOIL[J]. Acta Energiae Solaris Sinica. 2025, 46(4): 280-290 https://doi.org/10.19912/j.0254-0096.tynxb.2023-2060

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