2023 Fiscal Year Final Research Report
Fundamental study on seismic followability of culvert installed in embankment
| Project/Area Number |
21K14241
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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 | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | カルバート / 液状化 / 地震時追随性 / 2016年熊本地震 / 遠心模型実験 / 有限要素解析 / 力覚センサ |
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| Outline of Final Research Achievements |
Based on a survey of past earthquake damage, a three-dimensional model of the structure of an embankment including a box culvert built on a liquefiable foundation was developed and dynamic centrifuge loading experiments were conducted. The experimental results showed that liquefaction progressed more directly under the culvert than under the embankment, and that liquefaction progressed more directly under the joint than at the culvert mouth. To understand this phenomenon, a dynamic soil-water coupled elasto-plastic finite element analysis was conducted. The numerical analysis reproduced the phenomenon of liquefaction just below the culvert as in the experiment. This indicates that the bottom plate of the culvert contributed to the reduction of effective stress in the foundation soil.
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| Free Research Field |
地盤工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究成果から，見かけの単位体積重量の小さいカルバートのような構造物が液状化層を有する基礎地盤上に敷設された場合，液状化をより進行させる可能性が示された．このような可能性については，現行のカルバート工の設計指針において何ら留意されていない．このような事象を確認した先行研究が殆どなく，また，一般に上載構造物は基礎地盤内の有効応力を増大させるため，液状化にとって不利に働かないと考えられてきたことが原因と考える．本研究をさらに発展させることで，本事象の発生条件を一般化し，他の社会基盤構造物において同様の懸念がないか，明らかにすることが期待できる．
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