Instability of a caisson-type breakwater induced by an earthquake-tsunami event
Instability of a caisson-type breakwater induced by an earthquake-tsunami event
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地震海啸事件引起的沉箱式防波堤失稳
DOI：
10.1061/9780784413388.055
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Kazuhiro Tsurugasaki
中科院分区：
文献类型：
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作者：
Tatsuya Matsuda;Kenichi Maeda;Michio Miyake;Junji Miyamoto;Hiroko Sumida;Kazuhiro Tsurugasaki
在日本发生的东北大地震中，东北地区的一个沿海地区遭到了致命的破坏。然而，海啸灾害对海岸结构的影响机制尚未完全揭示。本文讨论了海啸灾害及其多尺度问题和多阶段水土相互作用对结构的影响。基于离心试验和海啸-土-结构相互作用的光滑颗粒流体力学（SPH）模拟结果表明，海啸渗流对海底土壤的冲刷导致防波堤失稳，从而导致地面强度下降。因此，在长期海啸力作用下，由于海底土体刚度降低，防波堤可能发生承载力破坏。
A coastal area in the Tohoku District was fatally damaged by the Great Tohoku Earthquake that occurred in Japan. However, the mechanism of the tsunami disaster for the coastal structure has not yet been completely revealed. In this paper, we discuss the tsunami disaster and how the multi-scaling problems and multi-phase interactions among the soil and water affect structures. Based on centrifuge tests and smoothed-particle hydrodynamics (SPH) simulations with tsunami-soil-structure interactions, the breakwater caused destabilization by scouring the seabed soil, which was a result of the tsunami seepage flow and, consequently, the ground strength decreased. Therefore, a bearing-capacity failure may occur in a breakwater exposed to long-acting tsunami forces due to the decrease in the rigidity of the seabed soil.