2023 Fiscal Year Final Research Report
Establishment of Evaluation Method for Reinforcing Irrigation Tunnels Using Cosmic Ray Muons
| Project/Area Number |
20K06297
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Review Section |
Basic Section 41030:Rural environmental engineering and planning-related
|
|---|
| Research Institution | Okayama University |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
西村 伸一 岡山大学, 環境生命科学研究科, 教授 (30198501)
|
|---|
| Project Period (FY) |
2020-04-01 – 2024-03-31
|
| Keywords | 農業用水路トンネル / 宇宙線ミュー粒子 / 多方向載荷試験 |
|---|
| Outline of Final Research Achievements |
In this study, cosmic ray muons that penetrate the ground and structures are measured to estimate density. The interaction between tunnel linings and the ground is clarified using a combination of numerical analysis and model experiments to consider the seismic reinforcement methods. For the density estimation using cosmic ray muons, experiments both in the laboratory and at a rockfill dam were conducted, and the accuracy of the density converted by muon detection is verified. In the numerical analysis of load experiments modeling the ground and tunnel linings, Rigid Body Spring Model (RBSM) is used to verify the numerical validity concerning the displacement of the loading plate, the internal displacement, the loading force, overall deformation of the model, and the crack occurrence conditions.
|
| Free Research Field |
地盤工学
|
| Academic Significance and Societal Importance of the Research Achievements |
実験室といったコンクリート構造物やロックフィルダムといった土構造物を対象に透過した宇宙線ミュー粒子を測定して密度を推定した．事前に測定していた値（理論値）と比較することで，その適用性と問題点について整理を行った．また，耐震補強工法を考慮するためトンネル覆工と地山の相互挙動の把握を行った．その際，数値解析にRBSMを用い，模型実験の結果と比較し，載荷板変位，内空変位量，載荷荷重，モデル全体の変形状況，ひび割れ発生状況などについて数値妥当性を確認した．これらの結果により，土木構造物の維持管理に対するミューオン調査の適用性と，RBSMによるトンネル覆工と地山の挙動評価の適用性を示すことができた．
|
