ジオテキスタイル補強土を用いた 耐越流侵食河川堤防の提案  [in Japanese] A NEW LEVEE TYPE COMPRISING GEOSYNTHETIC-REINFORCED SOIL TO INCREASE RESISTANCE AGAINST OVERFLOW EROSION  [in Japanese]

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Abstract

近年,局所的異常豪雨に伴う超過洪水の発生により,堤防の越流決壊が各地で毎年報告されている.本研究 では,省スペース・低コストな耐越流侵食強化堤防として,ジオテキスタイル補強土(GRS)と堤体表面のコ ンクリート製被覆工を一体化した新形式河川堤防を提案し,いくつかの条件下における越流実験を行い,新形 式・従来形式堤防の耐越流侵食性を調べた.その結果,洗掘防止工を導入した新形式堤防は全く侵食されず, 新形式堤防が極めて高い耐越流侵食性を有することが示された.また,新形式堤防は,裏のり面を5分と急勾 配としても2割勾配と同様な高い耐越流侵食性を維持でき,かつ,その様子は全体・部分補強にて確認された. 以上より,新形式堤防は省スペース・低コストで耐越流侵食性を大幅に強化し得る技術であることが示された.

Overflows of huge floods caused levee breaches at a great number of places. As a reinforcing technology to increase the resistance against overflow erosion, we performed a series of model tests on a new type of levee in which concrete panels connected to geo-grid layers reinforcing the backfill cover the slopes and crest of the levee, as well as conventional types. The model test revealed that 1) with a score protection in front of the toe of downstream slope, the new type levee exhibits much higher resistance against overflow erosion than the conventional type levee; 2) the new type levee even with a steep backslope of 1:0.5 can maintain the high resistance of overflow erosion. It is shown that the new type levee can function effectively as a flood barrier at low cost and small cross section.

Journal

  • Geosynthetics Engineering Journal

    Geosynthetics Engineering Journal 28(0), 265-272, 2013

    Japan Chapter of International Geosynthetics Society

Codes

  • NII Article ID (NAID)
    130004713845
  • Text Lang
    JPN
  • ISSN
    1344-6193
  • NDL Article ID
    026375099
  • NDL Call No.
    Z16-1575
  • Data Source
    NDL  J-STAGE 
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