| Summary: | 碩士 === 國立臺灣海洋大學 === 河海工程學系 === 102 === In recent years, the impact of climate change, extreme Typhoon waves occur frequently increasing. It could be induced the unstable liquefaction phenomenon of nearshore seabed soil and caused the sub structural damage. In this study, the Changhua County of offshore wind farm site was selected. By use of CiGu monitoring station of Typhoon storm wave types of Taiwan’s around nearshore area by Zeng Wenqian (2013) are adopted and combined with GeoStudio QUAKE/W program. The extremely wave-induced soil liquefaction of simulation mode under different return periods (as 50, 100, 200 years) was established The total stress distribution, effective stress distribution, pore water pressure distribution, and sea bed liquefied regional of seabed soil, and the submarine cable laying of stability are discussed.
From the results of OUAKE/W program and extremely wave-induced soil liquefaction of simulation mode analysis, the 50 return period waves caused by the Typhoon's maximum liquefaction depth is about 1.5 meter, and the 100 year return period waves caused by the Typhoon's maximum liquefaction depth is about 2 meter, and the 200 years return period waves caused by the Typhoon's maximum liquefaction depth is about 2 meter. The submarine Cable under wave loading action, the maximum vertical displacement can reach about 4.24 cm.
According to the liquefaction distribution depth and the vertical displacement of cables analysis results, the minimum proposal depth of submarine cable of Changhua Count’s offshore wind farm site could be at least up to 2 meter. It could induce the wave loading impact, and ensure the embedded stability of submarine cable.
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