地盤性状変化を考慮した海岸道路の後浜斜面の高波による破壊メカニズムの解明  [in Japanese] AN EXPERIMENT TO ELUCIDATE THE MECHANISMS BEHIND HIGH-WAVE-RELATED FAILURE OF BACKSHORE SLOPES ON COASTAL ROADS IN CONSIDERATION OF CHANGES IN GROUND PROPERTIES  [in Japanese]

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Abstract

オホーツク沿岸域における海岸道路の後浜斜面の被災状況を把握し,現地踏査により得られた後浜斜面の調査結果を踏まえ,相対密度やサクション動態,ベーンせん断強度を様々に変化させた高波による盛土の破壊実験を行った.その結果,緩い不飽和斜面では高波によるサクション低下に伴うコラップス現象,中~密な不飽和斜面では高波による洗掘が確認され,相対密度及び飽和度の変化に伴う海岸道路幅員の欠損パターンを明らかにし,高波による地盤性状変化に応じた海岸道路の破壊メカニズムを解明した.また,後浜斜面の崩壊量は,相対密度と飽和度によって異なることを明らかにした.

 In this study, on-site surveys based on reports of damage to backshore slopes on coastal roads along the Sea of Okhotsk in Hokkaido were conducted, and an embankment fracture experiment with model high waves was performed in consideration of the survey results. In the experiment, ground with varying relative density and vane shear strength was used to simulate various states of soil suction dynamics. The results highlighted the collapse phenomenon that occurs when soil suction is reduced by high waves on a partially saturated and loosened slope, and scouring caused by high waves was observed on a partially saturated slope with medium-to-high density. The patterns of coastal road damage that follow changes in the relative density and degree of saturation seen in the field soils were clarified, and the mechanism behind high-wave-related failure on coastal roads was elucidated in relation to changes in soil properties. The volume of backshore slope collapse was also found to depend on the relative density and degree of saturation of the slope's soil.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 72(2), I_1189-I_1194, 2016

    Japan Society of Civil Engineers

Codes

  • NII Article ID (NAID)
    130005282233
  • NII NACSIS-CAT ID (NCID)
    AA12508551
  • Text Lang
    JPN
  • Article Type
    journal article
  • ISSN
    1884-2399
  • NDL Article ID
    027811879
  • NDL Call No.
    YH267-236
  • Data Source
    NDL  IR  J-STAGE 
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