2013 Fiscal Year Final Research Report
Instability of caisson-type breakwater due to seepage and scouring of tsunami into rubble mound and seabed with earthquake, liquefaction and forward and backward waves
| Project/Area Number |
23360203
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geotechnical engineering
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
MAEDA Kenichi 名古屋工業大学, 工学(系)研究科(研究院), 教授 (50271648)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 津波 / 地震 / 複合災害 / 浸透破壊 / 支持力 / 液状化 / 洗掘 / 侵食 |
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| Research Abstract |
Destabilization scenario of breakwater due to an earthquake and a tsunami was revealed. In the huge earthquake, after the large and long earthquake motion caused the liquefaction with increasing excessive pore water pressure, the breakwater was settled. The breakwater received tsunami force after the earthquake acted. The bearing capacity of the breakwater was loosed due to the decreased of the ground strength. Moreover we discussed on the performance of the breakwater by use numerical simulation result of tsunami inundation depth with damage level of the breakwater.
Scours on the seabed due to tsunami causing reduction in bearing capacity of structures were examined by open-channel flow, overflow and seepage flow in rubble mound. During water flow, the vertically upward hydraulic gradient along with excess pore water pressure was generated in the saturated ground. The liquefaction-like phenomenon was observed in the ground.
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Research Products
(32 results)
