2022 Fiscal Year Final Research Report
Study on a rational liquefaction determination method considering the influence of seismic waveforms
| Project/Area Number |
19K15091
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 22030:Geotechnical engineering-related
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| Research Institution | Tokyo Denki University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 液状化 / 液状化判定 / 室内土質試験 / 繰返しねじりせん断試験 / 地震波形 |
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| Outline of Final Research Achievements |
The 2011 Great East Japan Earthquake and the 2016 Kumamoto Earthquake resulted in liquefaction-induced disasters. Additionally, there are concerns regarding the potential occurrence of devastating earthquakes with high magnitudes in the Nankai Trough and directly beneath the Tokyo metropolitan area. To effectively prepare for such seismic events, accurate and reliable liquefaction prediction is crucial, considering the specific characteristics of seismic waveforms, such as their amplitudes and frequencies. In this study, cyclic torsional shear tests were conducted to examine the characteristics of liquefaction in sandy soil under various seismic waveforms, assessing the influence of these waveforms on the soil's susceptibility to liquefaction.
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| Free Research Field |
土木工学のうち地盤工学を専門とし，地震地盤工学を主としている．
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| Academic Significance and Societal Importance of the Research Achievements |
地震波形の形状が液状化強度に及ぼす影響を定量的に定めた．そして現行の液状化判定手法との定量的な違いを示し，合理的な液状化判定の方法を提示したことは社会的意義が大きい．また，一連の実験を通じて不規則な地震動下での砂質土の液状化過程を考察したところ，地震波形の繰返し波数が多い場合はより液状化し易い波形特性であることを実験的に解明したことは学術的に新たな知見が得られて意義は大きい．
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