Innovations in Progressive Failure Prediction Using Peridynamics from a Fracture Mechanics Perspective

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K04957
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 25030:Disaster prevention engineering-related
• Research Institution: Ishikawa National College of Technology
• Principal Investigator: Shimbo Taiki 石川工業高等専門学校, 環境都市工学科, 准教授 (20572697)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 亀裂進展解析 / 地震動 / 進行性破壊 / 数値解析 / Peridynamics

Outline of Final Research Achievements

Understanding progressive failure phenomena is necessary for predicting landslide disasters. In this study, progressive failure is investigated from the viewpoint of fracture mechanics by using peridynamics (PD), which assumes that the slip surface is a crack. In detail, PD has been applied to geotechnical engineering, and the development of codes for elasto-plastic analysis and seismic response analysis, soil tests, and reproduction analyses have been conducted. Failure modes and fracture toughness values of clayey soils were clarified, and parameter studies of simulated earthquake external forces showed changes in crack propagation shapes with maximum acceleration and frequency. The results contribute to improving the accuracy of landslide prediction and are useful for understanding the fracture behavior of soils.

Free Research Field

地盤工学

Academic Significance and Societal Importance of the Research Achievements

地すべりなどの地盤破壊現象を解明するためには，物体が逐次分離していく進行的な破壊現象を扱う解析手法が必要である．しかし，亀裂の発生進展とその地盤の崩壊現象を同時に扱うことのできる手法は数多くない．本研究では亀裂進展解析手法Peridynamicsの地震応答解析や弾塑性解析への応用を行った．また，地盤の耐亀裂性能や地盤材料の破壊形態についても実験を通して明らかにしている．これらの実験結果の再現や再現された物理量を用いて地盤の亀裂発生から進展までを解析可能な手法の基礎が確立した．本手法を更に発展させることで地すべりの発生から崩壊までを扱える破壊力学的予測解析手法が確立し，土砂災害の軽減に繋がる．