降雨による斜面崩壊過程の監視の試み－電磁気学的手法を用いた実斜面におけるすべり面の推定と実斜面観測システムの構築－

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2016/05/01

タイトル(英語): Development of Monitoring System to Understand Preparation Processes of Rainfall-Induced Landslides―Estimation of Slip Surface and In-Situ Observation using Electromagnetic Methods―

著者名: 山崎　智寛（千葉大学大学院理学研究科），服部　克巳（千葉大学大学院理学研究科），金田　平太郎（千葉大学大学院理学研究科），酒井　英男（富山大学大学院理工学研究部），泉　吉紀（富山大学大学院理工学研究部），寺嶋　智巳（京都大学防災研究所）

著者名(英語): Tomohiro Yamazaki (Graduate School of Science, Chiba University), Katsumi Hattori (Graduate School of Science, Chiba University), Heitaro Kaneda (Graduate School of Science, Chiba University), Hideo Sakai (Department of Earth Sciences, University of Toyama), Yoshinori Izumi (Department of Earth Sciences, University of Toyama), Tomomi Terajima (Disaster Prevention Research Institute Kyoto University)

キーワード: 斜面崩壊，自然電位法，比抵抗探査，ボーリング調査，帯磁率異方性　　landslide，self-potential (SP) method，2-D electrical resistivity tomography (ERT)，boring survey，anisotropy in magnetic susceptibility

要約(英語): In order to mitigate landslide risks, monitoring of ground water is essential. Previous indoor experiments suggest that the self-potential approach has an advantage to establish the early warning system in performance to detect related signals and in cost. To evaluate results obtained from the previous indoor experiments, in-situ measurements are required. To achieve this, we selected a test slope at Nishiikawa, Tokushima, Japan and we performed preliminary electrical resistivity exploration (ERT) and core-sampling. The results of ERT show that there are low resistive areas in shallow depth ( < 3 m). The core-sampling results also indicate that there exists the structure which corresponds to slip surface. In addition, anisotropy in magnetic susceptibility was examined and the samples around the estimated the slip surface region provide the oblate ellipsoid characteristics. These results of ERT and core analyses are consistent and make convince the identification of the slip surface. Based on these preliminary results, we set up the in-situ self-potential observation at the slope and started measurements.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.136 No.5 （2016） 特集：電磁界を用いた自然災害軽減のための観測・予測・解析技術

本誌掲載ページ: 297-303 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/136/5/136_297/_article/-char/ja/