河川堤防の浸水時の間隙空気圧発生を抑制するシート対策工に関する実験的考察  [in Japanese] AN EXPERIMENTAL STUDY ON PREVENTION OF PORE-AIR PRESSURE GENERATION ON WATER SEEPAGE IN RIVER DYKE BY USING BREATHABLE - WATERPROOF GEOTEXTILE  [in Japanese]

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Abstract

河川堤防が豪雨時に急激な浸水を受けたとき,内部の間隙空気が封入されその圧力が増大することが指摘されている.本論文では,不飽和な模型地盤に降雨や河川を想定して浸水させ,そのときの飽和度,間隙空気圧の経時変化を測定する実験に基づき,浸水時の間隙空気の挙動を基礎的に考察した.そして,浸水に伴って間隙空気が封入されその圧力が増加し,更には,間隙空気が亀裂等の破壊現象を生じさせることを認めた.この空気圧発生や破壊現象に対処するため,地表面に透気性・低透水性シートを敷設した結果,浸水に伴う間隙空気圧発生等が抑制できることなどが得られた.

For evaluating the stability of river dyke, it is important to understand the influence of the behavior of pore-air on the water seepage in unsaturated soil, due to the possibility of pore-air trapped and compressed in the dyke. In this paper, the pore-air behavior in unsaturated soil is examined by the rainfall and river water infiltration experiments in one-dimension. As a result, it was recognized that the generation of pore-air pressure was attributed to the reduction of air permeability at the soil surface by the rainfall, and that the local crack in the soil occurred due to the larger pore-air pressure. And then, it was shown that the pore-air pressure generation was prevented in while keeping the air permeability at the surface by using the breathable - waterproof geotextile.

Journal

  • Geosynthetics Engineering Journal

    Geosynthetics Engineering Journal 28(0), 17-22, 2013

    Japan Chapter of International Geosynthetics Society

Codes

  • NII Article ID (NAID)
    130004706236
  • Text Lang
    JPN
  • ISSN
    1344-6193
  • NDL Article ID
    026373824
  • NDL Call No.
    Z16-1575
  • Data Source
    NDL  J-STAGE 
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