津波による長時間の越流に対するジオシンセティックス補強盛土の安定性に関する小型模型実験  [in Japanese] SMALL SIZE HYDRAULIC MODEL TESTS ON STABILITY OF GEOSYNTHETICS-REINFORCED SOIL AGAINST PROLONGED OVERTOPPING  [in Japanese]

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Abstract

本研究では,津波による長時間の越流に対する補強盛土の安定性を評価するために,小型水路を用いた系統的な模型実験を実施した.越流による実盛土の破壊は主に浸透現象よりも侵食現象により生じている点に着目し,模型実験に用いる盛土材料に浸透性が低く侵食性の高い性質を有するベントナイト混合珪砂を選定することで,盛土の破壊過程を模擬することが出来た.また,補強盛土は,盛土のり面に設置された土のうが堤体内の盛土材料の流出を抑制し,盛土内に敷設された補強材が土のうと堤体の一体性を向上させることで,高い越流抵抗性を示した.さらに,盛土下の支持地盤の洗掘が盛土構造の越流抵抗性に大きな影響を及ぼすことから,部分的な支持地盤改良および盛土最下層の改良の実験を行い,高い越流抵抗性を示すことを確認した.

Many earth structures such as railway embankment are damaged by the Tsunami generated by Pacific coast of Tohoku Earthquake. These damages were mainly caused by the prolonged overtopping of Tsunami. However, the detail mechanism of the erosion of embankment body as well as the influence of the erosion of supporting ground to the entire stability of the embankment have not been understood. In this study, therefore, a series of hydraulic model tests which imitates the prolonged overtopping phenomenon were carried out. The experiment revealed that the erosion speed decreased by arranging geotexile in the embankment. Furthermore, partial ground improvement can effectively decrease the influence of supporting ground erosion to the stability of embankment

Journal

  • Geosynthetics Engineering Journal

    Geosynthetics Engineering Journal 29(0), 95-102, 2014

    Japan Chapter of International Geosynthetics Society

Codes

  • NII Article ID (NAID)
    130005066336
  • Text Lang
    JPN
  • ISSN
    1344-6193
  • NDL Article ID
    026374639
  • NDL Call No.
    Z16-1575
  • Data Source
    NDL  J-STAGE 
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