Development of a Regional Assessment Method for Seismic Vulnerability of Slopes Using a Coupled Sliding Rigid-Block Model

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04235
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 22020:Structure engineering and earthquake engineering-related
• Research Institution: Tottori University
• Principal Investigator: Ono Yusuke 鳥取大学, 工学研究科, 教授 (00346082)
• Co-Investigator(Kenkyū-buntansha): 河野 勝宣 鳥取大学, 工学研究科, 准教授 (60640901) ; 和田 孝志 鳥取大学, 工学研究科, 准教授 (60832996)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 地震 / 地すべり / 斜面崩壊 / ハザード

Outline of Final Research Achievements

To achieve wide-area and accurate prediction of landslides and slope failures during earthquakes, we developed an advanced analytical method using a rigid sliding block. Although we couldn't create a coupled model of multiple rigid blocks, we extended the method to include three-dimensional seismic waves, which previous studies hadn't considered. For wide-area seismic slope-slip hazard assessment, we devised a method to discretize slope angle and orientation, determining hazards for each combination using rigid-slip blocks. Applying AHP-GIS-based analysis to slope failure areas from four earthquakes (2008 Hokkaido, 2008 Kumamoto, 2008 Iwate-Miyagi Nairiku, and 2004 Niigata-Chuetsu) showed topographic factors predominantly influence slope failure distribution. We also developed a numerical simulation model considering collapsed soil inflow on flood flow in river channels, confirming the model can represent changes in flo

Free Research Field

地震工学

Academic Significance and Societal Importance of the Research Achievements

国土の大半を山地が占める日本では，比較的規模の大きな地震が発生すると必ずと言えるほど地すべり・斜面崩壊が発生する．地すべり・斜面崩壊は，道路や水道といったライフラインを破壊する他，発生した崩壊土砂が土石流に発展するなどして広域的長期的に地域社会に影響を与える．そのため，地震による地すべり・斜面崩壊を予測する手法は常に発展させていかなければならない．本研究の研究成果は実用的な手法として広く用いられるまでにはギャップが多数残っているものの，これまでよりも技術レベルを一段上げることに貢献できたと考えられる．