| 講演要旨(和文) | | 洋上風力促進法が2019年4月に施行されることより，洋上風力発電施設建設に係る地盤調査は市場の拡大が見込まれている。従来の地盤調査はボーリング調査を主体に地質・物性評価を行ってきたが，外洋の厳しい海象環境では長期間におよぶボーリング調査はリスクが高く，代替手法を併用した調査計画が求められる。短期間でS波速度構造を把握することを目的として，ボーリング調査を必要としない「海底微動アレイ探査」を開発した。地質や地盤構造が既知な洋上風力建設予定地で適用性試験を実施し，海底面でもS/Nの良好な微動記録を収録できることを確認した。海底微動アレイ探査で推定したS波速度構造はPS検層と調和的であり，微動アレイ探査の洋上調査への適用性を示した。 |
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| | 講演要旨(英文) | | As the law for promoting offshore wind power was implemented in April 2019, it is expected to expand the submarine ground survey market for the construction of offshore wind power generation. In general ground surveys, the geological and physical properties are evaluated by boring, but since boring surveys at sea are time-consuming and risky, there is a high need for simpler survey method. For the purpose of grasping S-wave velocity structure in a short time, we have developed Offshore Microtremor Array Exploration that doesn't require boring surveys. Applicability test of this exploration was carried out at offshore wind construction site with known geology and ground structure, and it was confirmed that microtremor records with high SN ratio could be recorded even on the seabed surface. The S-wave velocity structure estimated by offshore microtremor array exploration is consistent with that of PS logging, indicating the applicability of microtremor array exploration to offshore ground survey. |
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