A Methodology for Estimating the Position of the Engineering Bedrock for Offshore Wind Farm Seismic Demand in Taiwan

Yu-Shu Kuo, Tzu-Ling Weng, Hui-Ting Hsu, Hsing-Wei Chang, Yun-Chen Lin, Shang-Chun Chang, Ya-Jhu Chuang, Yu-Hsiu Tseng and Yih-Ting Wong
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Yu-Shu Kuo: Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan 701, Taiwan
Tzu-Ling Weng: Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan 701, Taiwan
Hui-Ting Hsu: Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan 701, Taiwan
Hsing-Wei Chang: Taiwan Semiconductor Manufacturing Co., Ltd., Hsinchu 300, Taiwan
Yun-Chen Lin: Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan 701, Taiwan
Shang-Chun Chang: CECI Engineering Consultants, Inc., Taipei 114, Taiwan
Ya-Jhu Chuang: Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan 701, Taiwan
Yu-Hsiu Tseng: Cheng Da Environment and Energy Ltd., Taipei 104, Taiwan
Yih-Ting Wong: Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan 701, Taiwan

Energies, 2021, vol. 14, issue 9, 1-17

Abstract: Taiwan lies in the circum-Pacific earthquake zone. The seabed soil of offshore wind farms in Taiwan is mainly composed of loose silty sand and soft, low-plasticity clay. The seismic demand for offshore wind turbines has been given by the local code. Ground-motion analysis is required to consider the site effects of the soil liquefaction potential evaluation and the foundation design of offshore wind turbines. However, the depth of the engineering bedrock for ground motion analysis is not presented in the local code. In this study, we develop a three-dimensional ground model of an offshore wind farm in the Changhua area, through use of collected in situ borehole and PS (P wave (compression) and S (shear) wave velocities) logging test data. The engineering bedrock is the sediment at the depth where the average shear wave velocity of soil within 30 m, Vsd30 , is larger than 360 m/s. In this ground model, the shear wave velocity of each type of soil is quantified using the seismic empirical formulation developed in this study. The results indicate that the engineering bedrock lies at least 49.5–83 m beneath the seabed at the Changhua offshore wind farm. Based on these findings, it is recommended that drilling more than 100 m below the seabed be done to obtain shear wave velocity data for a ground response analysis of the seismic force assessment of offshore wind farm foundation designs.

Keywords: ground model; offshore wind farm; seismic demand (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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