Soundness evaluation method and toughening proposition for embankment focussing on soil structure
| Project/Area Number |
18K04356
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 22030:Geotechnical engineering-related
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| Research Institution | Hachinohe National College of Technology |
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Principal Investigator |
Kiyohara Yukoh 八戸工業高等専門学校, その他部局等, 准教授 (20369911)
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| Project Period (FY) |
2018-04-01 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2022: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2021: ¥130,000 (Direct Cost: ¥100,000、Indirect Cost: ¥30,000)
Fiscal Year 2020: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | 盛土 / 降雨 / 不飽和浸透 / しらす / 不飽和土 / 水分特性曲線 / 有限要素解析 / せん断 / 繰返し挙動 / 摩耗性 / 不飽和透水係数 / ベントナイト / 透水 / せん断試験 / 繰返し載荷 / 摩耗 / 粒子破砕 / 泥流状崩壊 / 火山灰質土 / 液状化 / 三軸試験 / 細粒分含有率 / 損傷評価 / 間隙構造 / 修復 |
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| Outline of Final Research Achievements |
Rainfall infiltration behavior and storage capacity on 18 years passed embankment composed of Shirasu soil(volcanic ash sand) were investigated to verify influence of degradation by measuring water content and suction during and after rainfall. The dry density and fine content at a surface area had especially been decreased to small value. By void expansion, water retention capacity had been tended to decrease during these 18 years.
Compressibility and abrasive wear on Shirasu soil particles were also quantified. Then soil-water coupled FEM step by step analyses were performed to clarify the liquefaction process considering those properties. Computer programs for nonlinear elasto-plastic model with kinematic hardening law were made and verified under strain or stress controlled condition.
Permeability and maximum strength on Bentonite mixed Shirasu soil whose fine particle had been lost were improved.
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| Academic Significance and Societal Importance of the Research Achievements |
施工後長期間経過した盛土の降雨時浸透挙動の変化を18年という長期間にわたって計測し，その間の植生変化が保水性，水分特性に及ぼす影響，表層付近での細粒分の流失，間隙比の増加を明らかにした，これは降雨時の浸透挙動，浸潤線の上昇の予測精度を上げることに寄与し，豪雨時の土砂災害ハザードマップ作成の際にも有用な情報源となる．表層付近の空隙を密実化するためのベントナイト粒子の補填実験を室内で行ったところ，透水性の低下回復は顕著であった.また，混入による最大強度が増加したが，せん断定数向上までは期待できなかった．
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Report
(6 results)
Research Products
(22 results)
