Investigation of failure mechanism of embankment under seepage condition and proposal of rational design and inspection method
Project/Area Number |
16H04412
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Geotechnical engineering
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Research Institution | Meijo University |
Principal Investigator |
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Project Period (FY) |
2016-04-01 – 2020-03-31
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Project Status |
Completed (Fiscal Year 2019)
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Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2017: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2016: ¥9,620,000 (Direct Cost: ¥7,400,000、Indirect Cost: ¥2,220,000)
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Keywords | 浸透 / 盛土 / 堤防 / 三軸試験 / 細粒土 / 礫質土 / 崩壊 / 一面せん断 / 破壊 / 河川堤防 / 斜面安定 / 吸水軟化 / 砂質土 / 中間土 / 浸透破壊 / すべり破壊 / 設計法 / 斜面 / 一面せん断試験 / 細粒分 |
Outline of Final Research Achievements |
By conducting this research which aims to propose the rational design and inspection of embankment under seepage condition, the following results were obtained. 1. A water absorption softening test was newly developed. It can rationally determine the mechanical constants for inspection and design of soil structures that collapse due to a decrease in effective stress under seepage conditions. 2. Using the newly developed direct shear box test apparatus that can be performed under seepage conditions, it was shown that there is a high correlation between the shear stress-displacement relationship and the fine contents loss-displacement relationship, and it was elucidated that movement and washout of fine grains are activated due to shear deformation. 3. In order to accurately determine the safety factor of slope failure under seepage conditions, a FEM analysis code that is coupling saturated-unsaturated seepage flow analysis and rigid-plastic finite element analysis has been developed.
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Academic Significance and Societal Importance of the Research Achievements |
盛土構造物は時間とともに安定化するとされているが,降雨や洪水による浸透条件下では著しくせん断強度が低下する細粒土材料が存在し,かつ,それが昨今の豪雨時の盛土被災に結びついていることを明らかとした。これは,本研究で開発,提案した吸水軟化試験による成果であり,浸透時に劣化する地盤材料の力学特性を適正に評価可能としたことによる。また,本研究では,特殊な一面せん断試験によって,浸透条件下での土構造物内の細粒分の移動・流失は,せん断変形に起因して活発化することも明らかにした。これは,盛土からの細粒分の流失現象が,より危険な破壊の兆候であることを学術的に示した初めての研究成果である。
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Report
(5 results)
Research Products
(57 results)
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[Journal Article] Characterization of transition from Darcy to non-Darcy flow with 3D pore-level simulations2017
Author(s)
Tachibana, I., Moriguchi, S., Takase, S., Terada, K., Aoki, T., Kamiya, K. and Kodaka, T.
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Journal Title
Soils and Foundations
Volume: 57(4)
Pages: 707-719
Related Report
Peer Reviewed / Open Access
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