波による液状化と地盤流動への影響:最新事例分析  [in Japanese] WAVE-INDUCED LIQUEFACTION AND SEDIMENT FLOW DYNAMICS: THE LATEST CASE STUDY  [in Japanese]

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Abstract

本論文では,波による残留水圧の蓄積による液状化ならびに海底液状化流動の特性・機構に関する筆者らの近年の成果・知見を取纏めて提示すると共に,両者のメカニズムの重要性を端的に示した最新の事例分析を示している.2014年末に生じたイベントに対して,これまでに得られた知見をふまえた定量的な検討を行った結果,浚渫土の沖捨てにより形成されたシルト質地盤が高波による残留水圧の蓄積により液状化し重力流に遷移した結果,長距離流動・再堆積したことを明らかにした.又,これらの被災リスクを評価・予測するための基盤を提示した.

 This paper presents a concise summary of our recent research advances on wave-induced liquefaction and submarine liquefied sediment flow dynamics. The importance of both mechanisms is illustrated by a latest case study. A quantitative analysis of the event that took place in December 2014 demonstrates that the silty ground formed by repeated pouring of dredged soils underwent liquefaction due to the build-up of residual pore water pressures under sufficiently high wave conditions, and subsequently transformed itself into the form of sediment gravity flows, travelling a long distance and re-deposited. The paper also presents and discusses the analytical basis by which to predict and assess these phenomena for disaster mitigation.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 72(2), I_378-I_383, 2016

    Japan Society of Civil Engineers

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