Mechanical Properties of fiber-reinforced granular media based on the multi-scale modeling

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K06493
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geotechnical engineering
• Research Institution: Hachinohe Institute of Technology
• Principal Investigator: Kaneko Kenji 八戸工業大学, 大学院工学研究科, 教授 (30333834)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: ファイバー混合補強土 / 粒状体 / 強度変形特性 / 数値解析

Outline of Final Research Achievements

We clarified the appearance mechanism of optimum mixture ratio which was reinforced soil by mixing short fiber with the tri-axial compression tests and the numerical experiments using four types silica sand. It was clarified that when mixing too much, become too easily slip at boundary between short fiber and soil particles, and that negative effect outweighs positive effect so optimum mixture ratio will be appears. It is very important that there is an optimal solution for the mixture ratio of short fiber mixing reinforced soil. And it can contribute to the elucidation of the improvement mechanism of the mechanical properties of the granular material by mixing of short fibers.

Free Research Field

地盤工学

Academic Significance and Societal Importance of the Research Achievements

本研究の成果として，ファイバー混合補強土において強度に対してファイバーの混合率に最適値（最適混合率）が存在することを初めて明らかにした．また，最適混合率が，土粒子サイズに依存する事を発見し，土粒子のサイズが小さい程，最適混合率が大きくなることを実験的に示した．さらに，数値解析によりその補強メカニズムを明らかにした．
これらの成果により，ファイバー混合補強土が普及することで，粘り強い構造物の構築に貢献できる。また，竹チップ・間伐材チップやヤシ繊維などの天然材料を利用した地盤補強技術の普及による環境配慮型インフラ構築への貢献が期待できる。