Search Results 1-15 of 15

  • Predictions of snowmelt type volcanic mudflow under various snow conditions  [in Japanese]

    YAMAGUCHI Shota , MIYATA Shusuke , TSUTSUMI Daizo , MURASHIGE Keiki , FUJITA Masaharu

    … <p>We proposed a distributed model to simulate occurrence of snowmelt type volcanic mudflow in upstream hillslope areas. … The model included processes of heat transfer between snow and erupted sediment layers, snowmelt, vertical infiltration of snowmelt water in the snow layer, slope failures at the snow-soil and soil-bedrock boundaries, erosion due to surface runoff including sediment (i.e., mudflow) and deposition by the surface runoff with excess sediment concentrations. …

    Journal of the Japan Society of Erosion Control Engineering 71(6), 3-13, 2019

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  • Cyclic Shear Behavior of Unsaturated Soil with Varying Pore Water and Pore Air Condition  [in Japanese]

    UNNO Toshiyasu , MIDORIKAWA Yusuke

    <p>地震時に発生する流動性崩壊の流下土砂は,飽和度が100%未満である場合が多く,メカニズムについて未解明な点が多い.不飽和土の力学挙動は,既知の通り間隙空気や間隙水の状態に応じてせん断強度や発生するせん断ひずみ等,せん断変形挙動が大きく影響を受けることから,メカニズム解明には水分状態と繰返しせん断変形挙動の関係について検討する必要がある.本研究では,空気連行剤(AE剤)を使用し強制 …

    Journal of Japan Association for Earthquake Engineering 19(5), 5_170-5_183, 2019

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  • Mudflow Type Failure of Volcanic Soil During the Earthquake

    UNNO Toshiyasu

    Proceedings of the 2nd Join Conference of Utsunomiya University andUniversitas Padjadjaran Nov.24, 2017, 129-138, 2017-11-24

    IR 

  • CYCLIC UNDRAINED TRIAXIAL TESTS FOR LIQUEFACTION STRENGTH AND DEFORMATION PROPERTIES OF SATURATED AND UNSATURATED NINOHE SHIRASU  [in Japanese]

    KIYOHARA Yukoh

    東北地方太平洋沖地震において,飽和度が高い状況下でしらすからなる宅地盛土が泥流状に崩壊した.このメカニズム解明のために,当該箇所から採取した試料土を相対密度<i>D</i><sub>r</sub>: 60%~65%に再構成し,飽和状態と不飽和状態において,それぞれ100kPaで圧密後(<i>D</i><sub>rc …

    Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering) 72(3), 196-203, 2016

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  • Liquefaction of unsaturated sand considering the pore air pressure and volume compressibility of the soil particle skeleton  [in Japanese]

    UNNO TOSHIYASU

    本件は,地震時に盛土や斜面が泥流化する「流動性崩壊」について,その崩壊メカニズムの解明を目指して行った一連の研究について論じたものである.研究では,既往の被災事例の現地調査や崩壊土砂に対し力学試験を実施し変形挙動の把握を行った.その結果,今日まで把握が困難とされてきた不飽和土の液状化メカニズムを実験・理論的に示すことにより流動性崩壊機構を解明し,成果に基づき危険度判定手法を提案した.本研究の優位性 …

    NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan 60(0), 46-46, 2011

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  • Three Dimensional Measurement by Satellite Remote Sensing for Disaster Monitoring

    Nakagawa Takahiro , Hyodo Masashi , Takagi Masataka

    … SHIKOKU Island in Japan has many slope failure disasters by the torrential rain every year. … The slope failures induce other serious disaster such as landslide, mudflow and debris flow. … Therefore, hidden slope failure must be found immediately. … The 3D measurement using PRISM has a potential to detect slope failure. …

    Society for Social Management Systems Internet Journal 4(1), 2008-03

    IR 

  • Estimation of Strong Ground Motions at Tsukidate Landslide Site during the 2003 Sanriku-Minami Earthquake:Realization of Ground Motion Waveforms using the data of Strong Motion Seismometers and Seismic Intensity and Its Fluidization Mechanism using Laboratory Testing

    FUKUMOTO Shun'ichi , UNNO Toshiyasu , SENTO Noriaki , UZUOKA Ryosuke , KAZAMA Motoki

    三陸南地震 (2003) が発生した際, 旧築館町舘下地区において谷沿いに堆積していた火山灰質砂質土が崩壊し流動性土砂となって斜面下をすべり落ちた. この時, 築館周辺において地震動が記録されていなかったことから, 不飽和火山灰質砂質土の流動化による崩落メカニズムを震度や強震記録との関連性から議論することができなかった. そこで本研究では, K-NET 築館地点の余震記録と周辺の強震記録, 震度情 …

    Journal of Japan Association for Earthquake Engineering 7(2), 160-179, 2007

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  • CHANGE OF MOISTURE AND SUCTION PROPERTIES OF VOLCANIC SAND INDUCED BY SHAKING DISTURBANCE

    UNNO TOSHIYASU , KAZAMA MOTOKI , UZUOKA RYOSUKE , SENTO NORIAKI

    Mudflow type failure of a gentle fill slope occurred at Dateshita, Tsukidate town during the 2003 Sanriku-Minami earthquake in Japan. … It is considered that the observed nature in two tests results, which is attributable to the peculiarity of the volcanic sandy soil with pumice, may be related to mudflow-type slope failure.<br> …

    SOILS AND FOUNDATIONS 46(4), 519-528, 2006

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  • CHANGE OF MOISTURE AND SUCTION PROPERTIES OF VOLCANIC SAND INDUCED BY SHAKING DISTURBANCE :

    UNNO TOSHIYASU , KAZAMA MOTOKI , UZUOKA RYOSUKE , SENTO NORIAKI

    Mudflow type failure of a gentle fill slope occurred at Dateshita, Tsukidate town during the 2003 Sanriku-Minami earthquake in Japan. … It is considered that the observed nature in two tests results, which is attributable to the peculiarity of the volcanic sandy soil with pumice, may be related to mud flow-type slope failure. …

    Soil and foundation 46(4), 519-528, 2006

    NDL Digital Collections  Cited by (1)

  • 長江・三峡ダム湖水域,雲陽・奉節・巫山地域の新旧巨大地すべり  [in Japanese]

    TAKAHAMA Nobuyuki , FURUKAWA Akio , ZHOU Yaming

    … Many landslides (in a broad sense, including slope failure and rock fall) are distributed along the both banks of the dam reservoir. … We found that the geology of new Fenjie and Wushan towns are composed of semiconsolidated ancient landslide materials, e.g. landslide debris, landside blocks and mudflow deposits. …

    Annual report of the Research Institute for Hazards in Snowy Area,Niigata University (26), 93-99, 2004

    IR 

  • Development of the Evaluation Method of the Slope Failure for Pre-Evaluation of Highway Route in Shirasu Area.  [in Japanese]

    KUMAGAI Kiichiro , OBAYASHI Shigeyuki , KAWAIDA Minoru , SAITO Genya

    本研究では, 衛星データや地理データ, さらにはそれらの処理/解析結果等の二次生成情報を対象に, シラス地帯に計画された路線に対する広域的な事前土地評価 (崩壊影響評価) のためのアルゴリズムを開発した. シラス地帯に広く分布する侵食斜面では斜面崩壊の発生とともに多量の土砂が流下するケースの多いことに着目し, 衛星データと地理データより作成された斜面安定性評価図から崩壊影響評価に関わる情報を抽出・ …

    Doboku Gakkai Ronbunshu 1999(623), 247-257, 1999

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  • Failure Mechanism of Sumikawa Landslide : Results of Sumikawa Landslide Investigation and Outline of Landslide Control Works  [in Japanese]

    OGAWAUCHI Yoshito , YAMAZAKI Tsutomu , YAMASAKI Takanari , KIKUCHI Akira , OBARA Yoshiyuki , HOSAKA Kaneo

    1997年5月, 八幡平熱水変質地帯に発生した澄川地すべりは, 地すべり発生と同時に水蒸気爆発と土石流が発生した特異な地すべりである。すべり面は, モンモリロナイトを多量に含む変質した第四系の澄川凝灰岩上面に形成されている。ボーリングの孔内温度は, すべり面に近づくにしたがって上昇し, すべり面以深では100度に達する。地すべり地内の地下水は弱アルカリ性を示し, 埋没した澄川温泉の酸性泉とは際だっ …

    Landslides 35(2), 38-45, 1998-09-15

    J-STAGE  References (6) Cited by (3)

  • Measurement of the Slope Failures Frequency on Sediments with Tephrochronological Analysis

    YANAI Seiji , USUI Goro

    … Recurrence times of the slope failure during the last 930 years were revealed with tephrochronological method. … Trenches dug out on the sediments were observed and recurrence times of the slope failure were estimated by counting failure deposits above tephra layers. … Average of the slope failure during the last 300 years was 1. …

    Sabo Gakkaishi 42(2), 3-10, 1989

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  • Lateral Loads on Offshore Structures Exerted by Submarine Mudflows  [in Japanese]

    TOWHATA IKUO , ALHUSSAINI T.M.

    … One of the hazards in the marine environments is a failure of submarine slopes which is caused by earthquakes, wave action, rapid sedimentation, etc. … A series of model tests were carried out to understand the intensity of the drag force which is brought about by a mudflow on a cylindrical solid column. …

    Journal of the Japanese Society of Soil Mechanics and Foundation Engineering 28(3), p26-34, 1988-09

    NDL Digital Collections 

  • Lateral loads on offshore structures exerted by submarine mudflows.

    TOWHATA IKUO , ALHUSSAINI T.M.

    … One of the hazards in the marine environments is a failure of submarine slopes which is caused by earthquakes, wave action, rapid sedimentation, etc. … A series of model tests were carried out to understand the intensity of the drag force which is brought about by a mudflow on a cylindrical solid column. …

    SOILS AND FOUNDATIONS 28(3), 26-34, 1988

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