Abst'/> Centrifuge modelling for stability evaluation of a breakwater foundation subjected to an earthquake and a tsunami
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Centrifuge modelling for stability evaluation of a breakwater foundation subjected to an earthquake and a tsunami

机译：用于地震和海啸的防波堤基础稳定性评估的离心机模型

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AbstractMany breakwaters were failed due to the geo-disaster caused by the 2011 off the Pacific Coast of Tohoku Earthquake and Tsunami. Investigations were carried out, and it was found that the breakwater failed mainly due to the failure of its foundation. However, mechanism of the failure of the breakwater has not yet been completely explained. This paper focuses on the stability evaluation of a breakwater foundation subjected to an earthquake and a tsunami. The main feature of the study is application of centrifuge technique for a geo-disaster caused by an earthquake and a tsunami. Results of the study show that in the case of a geo-disaster brought by an earthquake and a tsunami, excessive pore water pressure generated in the sandy ground, and consequently liquefaction occurred during the earthquake. That resulted in deformation of the foundation ground and settlement of the breakwater. During the tsunami, scouring could occur around the harbor side mound, and seepage took place beneath the breakwater. These were the main reasons of decrease in bearing capacity of the foundation ground and failure of the breakwater. Numerical simulations were also performed to make clear the mechanism and behavior of the breakwater under an earthquake and a tsunami. Overall, this study can be useful to understand the failure process of a breakwater under an earthquake and a tsunami, and it can be helpful to develop countermeasures in order to reduce the earthquake and tsunami induced damage of a breakwater in the future.Highlights•Stability evaluation of a breakwater due to an earthquake and a tsunami.•Failure of a breakwater due to the damage of its foundation.•Foreshocks and main shock were considered for the earthquake loading.•Deformation of the foundation soils occurred during the earthquake loadings.•Scouring and seepage were main reasons of the foundation failure during the tsunami.
机译： 摘要 由于2011年东北太平洋地震和海啸造成的地质灾害，许多防波堤都失败了。进行了调查，发现防波堤的破坏主要是由于其基础的破坏。但是，防波堤破坏的机理尚未完全阐明。本文着重于地震和海啸对防波堤基础的稳定性评估。该研究的主要特征是离心技术在地震和海啸造成的地质灾害中的应用。研究结果表明，在地震和海啸造成的地质灾害的情况下，沙地中产生的孔隙水压力过高，从而在地震过程中发生了液化。这导致地基变形和防波堤沉降。在海啸期间，可能会在海港边丘周围发生冲刷，并且在防波堤下方发生渗漏。这些是基础地基承载力下降和防波堤破坏的主要原因。还进行了数值模拟，以明确地震和海啸下防波堤的机理和行为。总体而言，该研究有助于理解地震和海啸下的防波堤的破坏过程，并有助于制定应对措施，以减少将来由地震和海啸对防波堤造成的破坏。 亮点 • 由于地震和海啸。 • 防波堤由于其基础损坏而失败。 • 地震荷载考虑了前震和主震。 • 在地震荷载作用下，基础土壤发生了变形。 • < ce：para id =“ p0030” view =“ all”>在海啸期间，冲刷和渗水是造成基础破坏的主要原因。

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