FAILURE MECHANISM AND LOAD TRANSFER OF THE BREAKWATER WITH STEEL PIPE PILES UNDER TSUNAMI OVERFLOW

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  • 鋼杭による防波堤補強工法の津波越流時における破壊モードの考え方と一考察
  • コウ クイ ニ ヨル ボウハテイ ホキョウ コウホウ ノ ツナミエツリュウジ ニ オケル ハカイ モード ノ カンガエカタ ト イチ コウサツ

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Abstract

 In “The 2011 off the Pacific coast of Tohoku Earthquake”, many breakwaters in the coastal areas suffered extensive damage under tsunami overflow. It has been needed to develop the methods of reinforcing the breakwater, tenaciously.<br> One of the reinforcing methods to resist tsunami, installing a steel wall behind the breakwater, was proposed by Oikawa, et al. (2014), called “Steel Pipe Method” here. In the series of loading tests, the model caisson on the dry sandy ground wad loaded horizontally. Applying the combination of steel wall and filling between the wall and the caisson improved the horizontal resistance of the caisson effectively. And, this improving method changes the failure mode of the caisson from sliding into ground bearing failure even in scouring cross section. And the hydraulic model tests and the analyses was conducted by Arikawa, et al (2015). The experimental results show that “Steel Pipe Method” improves stability of breakwater under tsunami overflow.This paper deals with the stability of the breakwater installing “Steel Pipe Method”, which can be examined from quantitative dynamic equilibrium.

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