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発表 Case study of estimation for a subsurface structure along a tunnel site by helicopter magnetometry

作成年度 2011年度
論文名 Case study of estimation for a subsurface structure along a tunnel site by helicopter magnetometry
論文名(和訳) ヘリコプターを利用した磁気計測によるトンネル地山の地質構造の評価事例
論文副題
発表会 Korea-Japan Joint Symposium for Studies on Survey and Evaluation Technologies of Underground Environment
誌名(No./号数)
発表年月日 2011/11/08 ~ 2011/11/11
所属研究室/機関名 著者名(英名)
防災地質チーム岡崎 健治(OKAZAKI Kenji)
防災地質チーム伊東 佳彦(ITO Yosihiko)
愛媛大学榊原 正幸(SAKAKIBARA Masayuki)
抄録
A helicopter-borne magnetic survey (HMS) was carried out to verify its applicability for geotechnical evaluation of a mountainous tunnel site before the tunnel construction in northeastern Hokkaido、 Japan. The distribution of magnetic intensity (MI) is obtained by HMS results. While the tunnel construction、 magnetic susceptibility (MS) of advanced horizontal boring cores were measured and precise rock type classification was also carried out in order to check the MI by HMS. The geology around the tunnel site is basalt、 chert、 pyroclastic rock、 hyaloclastite、 and those mixed with pillow lava. As a result、 geological profile models along the tunnel site was drawn based on the geological survey results、 and was drawn based on an analysis result of observed magnetic curve by HMS over the tunnel route before its excavation. Both probable models showed an almost similar tendency. MS was highest in massive basalt、 hyaloclastite、 pillow lava、 mixed rock and chert in order of the strength. Consequently、 the geological profile models almost correspond to the rock type distributions. Thus、 the information of geological outline of tunnel site could be grasped by HMS.
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