A HYDRAULIC MODEL EXPERIMENT ON IMPULSIVE WAVE BREAKING FORCE AND VIBRATION OF UPRIGHT SEAWALL AND HINTERLAND

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  • TANAKA Tsutomu
    国立研究開発法人 海上・港湾・航空技術研究所 港湾空港技術研究所 海洋研究領域 耐波研究グループ
  • SUZUKI Kojiro
    国立研究開発法人 海上・港湾・航空技術研究所 港湾空港技術研究所 海洋研究領域 耐波研究グループ

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  • 直立護岸に作用する波圧と背後地盤の振動に関する一実験

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<p> The breaking wave pressure can cause seawall and hinterland vibrations. In this study, to clarify the mechanism of this vibration, we conducted a hydraulic experiment. As a result, the followings were clarified. 1) An impulsive breaking wave force caused the seawall to vibrate, and the maximum acceleration was 6 m/s2. 2) The acceleration of the hinterland just behind the seawall was 1/10 of that of the seawall and decreased with the distance from the seawall. 3) Only the vibration with the natural frequency of the hinterland propagated. In contrast, other components besides this frequency attenuated with the propagation. 4) The phases of the horizontal and vertical components differ by half a period. This characteristic indicates that the vibration was a Rayleigh wave. 5) The trench to prevent the propagation of vibration was not very effective.</p>

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