Development and Estimation of Mathematical Modeling for Ballast Simulations and Earthquake Resistant Ballast Ground Mixed with the Stabilized Structure

2019 Fiscal Year Final Research Report

• Project/Area Number: 16K13734
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Computational science
• Research Institution: University of Toyama
• Principal Investigator: Okumura Hiroshi 富山大学, 学術研究部教育研究推進系, 准教授 (30355838)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Keywords: マルチスケール変分法 / 固体力学 / 流体力学

Outline of Final Research Achievements

In recent years, earthquakes with an epicenter in Tokyo metropolitan area and Nankai Trough area have been predicted to occur in Japan. What we should start right now is to research and develop a resilient disaster prevention and mitigation functions of ballast foundations. A hardware technology to improve the seismic resistance of ballast foundations is required. Therefore we have studied and developed its numerical modelings and numerical analysis method. In this research, the modeling is to elucidate the material properties and mechanism of soil composed of ballast granular materials. Furthermore, by comparing the empirical data from a large scale triaxial test with the simulation, we were able to determine the effect of the earthquake resistance. A stabilized structure and an earthquake-resistant foundation were developed to improve the earthquake resistance of the ground.

Free Research Field

計算力学

Academic Significance and Societal Importance of the Research Achievements

本研究で開発したマルチスケール変分法に基づく有限要素法では，バラスト材料力学だけでなく様々な物理現象に対する適用一般性を持つため，ほとんどの土木・地盤・工業材料における不均質材料の力学的材料特性を解明することができる．現在，土木・地盤・工業分野などにおける非均質材料の力学特性を定量的に分析する技術はバラスト材料のみならず幅広い分野において重要な存在となっており，将来的にも本研究開発課題は分野を超えた新材料の創出・高度化が得られる．今般，広島県で甚大な被害を及ぼした土石流が記憶に新しいが，本研究が成功した場合には，土石流の高精度予測技術としても応用できる．