2021 Fiscal Year Final Research Report
Effect of Mechanical Behavior of Joints in Steel Pipe Sheet Pile Foundations on Horizontal Resistance of the Entire Foundation
| Project/Area Number |
19K15087
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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) |
2019-04-01 – 2022-03-31
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| Keywords | 鋼管矢板基礎 / 水平抵抗 / 継手 / 遠心模型実験 |
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| Outline of Final Research Achievements |
Steel pipe sheet pile foundations are a unique foundation type in Japan in which steel pipe sheet piles with joints are cast in a closed geometry and the joint tubes are filled with mortar to connect the entire foundation. In this type of foundation, the evaluation of the joints between steel pipes is considered to have a great influence on the horizontal resistance of the entire foundation. In this study, three-dimensional characteristics of the joints were clarified by model tests, and horizontal loading tests were conducted on the entire foundation to investigate the horizontal resistance. Furthermore, it is shown that the numerical analysis can reproduce the experimental results with sufficient accuracy by appropriately taking into account the characteristics of the joints.
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| Free Research Field |
地盤工学
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| Academic Significance and Societal Importance of the Research Achievements |
現状における鋼管矢板基礎の設計は，簡易な2次元解析を用いて行われる場合がほとんどであり，継手部の挙動が基礎全体の水平抵抗に与える影響を適切に表現しているとは言い難い．一方，工費削減を目的として，従来の継手に比べ高剛性・高耐力を有する継手や，深部の継手を省略した構造などが提案されており，これらを評価しうる設計手法が求められる．本研究で実施した模型実験とその再現解析により，実務で使用する3次元解析手法の精度検証が可能となり，鋼管矢板基礎の設計・施工の合理化に大きく資する結果が得られた．
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