Study on characteristics and appearance conditions of internal erosion of gravelly river levees

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04252
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 22030:Geotechnical engineering-related
• Research Institution: Gifu University
• Principal Investigator: Kamiya Kohji 岐阜大学, 工学部, 教授 (50252119)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 河川堤防 / 内部浸食 / 礫質土 / 粒度 / 間隙径分布

Outline of Final Research Achievements

In this study, the characteristics and appearance conditions of internal erosion associated with seepage flow during floods in gravelly river levees were investigated. The representative void size index for permeability in the soil was proposed based on the observation of void by X-ray CT scanner and the measurement of void size distribution. It was recognized that the permeability was reduced with the movement fine particles in the void by the permeability test. Furthermore, it was suggested that the appearance possibility of the internal erosion can be estimated by the relationship between the void size index and the particle size of the soil.

Free Research Field

地盤工学

Academic Significance and Societal Importance of the Research Achievements

本研究は，河川堤防の安全性に資する検討課題であり，特に透水性の高い礫質な河川堤防における内部浸食の可能性について基礎的に究明したものである．河川堤防の粒度条件によって内部浸食の発生する場合を確認し，それによって浸透現象に影響することを示した．即ち，礫質河川堤防において留意すべき現象とみられ，今後の河川堤防管理に寄与することが考えられる．