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タイトル: 2014年広島災害における表層崩壊の発生メカニズムと降雨閾値
その他のタイトル: Triggering Mechanisms and Rainfall Threshold of Shallow Landslides: Cases in the Hiroshima Disaster on 20 August 2014
著者: 松四, 雄騎  kyouindb  KAKEN_id
渡壁, 卓磨  KAKEN_name
鄒, 青穎  KAKEN_name
平田, 康人  KAKEN_name
千木良, 雅弘  KAKEN_name
著者名の別形: MATSUSHI, Yuki
WATAKABE, Takuma
TSOU, Ching-Ying
HIRATA, Yasuto
CHIGIRA, Masahiro
キーワード: 表層崩壊
降雨閾値
土層
間隙水圧
斜面減災
shallow landslide
rainfall threshold
soil layer
pore-water pressure
slope disaster mitigation
発行日: Jun-2015
出版者: 京都大学防災研究所
誌名: 京都大学防災研究所年報. A = Disaster Prevention Research Institute Annuals. A
巻: 58
号: A
開始ページ: 24
終了ページ: 33
抄録: Triggering mechanisms and rainfall threshold of shallow landslides were discussed based on field and laboratory surveys for the disaster by heavy rainfall on 20 Aug 2014 at Hiroshima, southwest Japan. Shallow landslides occurred in areas of maximum 3 h-rainfall >160 mm/3h with hourly rainfall intensity >70 mm/h. Hillslopes with bedrock of granite and hornfels slid severely, while areas underlain by rhyolite suffered only sparse landsliding. Three types of landslide were identified in field observation: 1) planer translational landslide, 2) gash-out failure, and 3) wedge sliding. Lithological and subsurface structural factors seem to affect the occurrence of these different types of landslide. Majority of landslides in granite hillslopes and about half in hornfels were planer translational landslides. This type forms a sliding surface within soil layer along mechanical or hydraulic discontinuity at a depth of ~1 m. Other half of landslides in hornfels area was gash-out failure with scars of 1–3 m deep, outcropping an openwork gravel layer at the bottom. Water supply exceeding drainage capacity of this conduit may generate excess pore-water pressure, leading to fluidization of overburden. Wedge sliding was a minor type, with a shallow gullying of soil or a deeper slip surface in bedrock (~5 m), occurring along geologic discontinuity such as joints, faults and dykes. Prediction of potential sites, timings, and magnitude of such landslides requires detailed investigations of thickness and mechanical strength of potential sliding material, observation and modeling of subsurface hydrological processes.
URL: http://www.dpri.kyoto-u.ac.jp/nenpo/nenpo.html
URI: http://hdl.handle.net/2433/210036
出現コレクション:Vol.58 A

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