2023 Fiscal Year Final Research Report
Establishment of evaluation method for the heterogeneity of compacted earth sructures and systematization of design and construction management processes
| Project/Area Number |
21K04261
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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 | Kindai University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
麓 隆行 近畿大学, 理工学部, 教授 (30315981)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 締固め / 転圧 / 盛土 |
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| Outline of Final Research Achievements |
"Compaction" can be defined as the process of compressing a soil material in a certain moisture state to drain air and achieve densification. Therefore, it involves complex interactions among soil particles, water, and air within the soil material and can be regarded as a boundary value problem. The quality of construction is significantly influenced by the construction process. Here, we elucidated the heterogeneity of compaction degree resulting from roller compaction used in actual construction through numerical simulations. Additionally, we conducted physical investigations on actual embankments to demonstrate the causes of heterogeneity during construction.
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| Free Research Field |
地盤工学
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| Academic Significance and Societal Importance of the Research Achievements |
盛土造成時には予め現地で実物大の「締固め」試験を実施し，求められる「締固め度」を達成できる様に，施工層厚や転圧回数といった施工方法を決定してきたが，同じ施工方法であっても，材料の含水状態によって仕上がり品質が異なることを示した．また，実際に施工に用いる転圧では，地盤内にせん断応力生じさせながら移動することを意味し，弾塑性材料である地盤材料においては，初期の転圧方向が盛土内の不均一性に影響を及ぼすことが明らかとなった．これは研究成果として挙げている物理探査結果でも分かるように，盛土内での透水性の局所化にもつながることを示す．今後，材料の含水状態に応じた施工方法を模索することが重要となる．
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