| Project/Area Number |
17K14720
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Geotechnical engineering
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| Research Institution | Nagoya University |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2017: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 不飽和土 / 水分特性 / 封入空気 / 変形解析 / 有限変形解析 / 有効飽和度 / 水分特性曲線 / 地盤工学 |
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| Outline of Final Research Achievements |
In order to comprehend the mechanical behavior of unsaturated soil, which consists of not only soil particle and water but also air, it is necessary to comprehend the soil water characteristic. In this study, a new soil water characteristic model based on actual condition of pore water and air was proposed: pore air was divided into trapped air and continuous air, and pore water was divided into adsorbed water and free water. Incorporating the soil water characteristic model, a new deformation analysis method of unsaturated soil was developed. Next, in order to validate the analysis method, mechanical tests and their numerical simulations were conducted. As a result, the analysis method succeeded in expressing the compressibility of trapped air and hysteresis during water absorption and drainage caused by the existence of trapped air which cannot be expressed by the past analysis method.
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| Academic Significance and Societal Importance of the Research Achievements |
「封入空気の圧縮性」を表現可能になったことで、動的にも対応した本解析コードを用いれば、近年注目を集める不飽和化による地盤改良がもたらす耐震効果の評価も可能となる。また、「封入空気の存在に起因した水分特性の吸排水時のヒステリシス性」を表現可能になったことで、降雨と乾燥の繰返し履歴を受ける不飽和土の力学挙動をより精緻に把握でき、豪雨による地盤・土構造物の性能評価をより精度良く行うことが可能となる。
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