Estimation of landslide behavior and improvement of stability evaluation during earthquake based on dense seismic observation

2020 Fiscal Year Final Research Report

• Project/Area Number: 17H04734
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Natural disaster / Disaster prevention science
• Research Institution: Kyoto University
• Principal Investigator: Doi Issei 京都大学, 防災研究所, 助教 (00572976)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Keywords: 地すべり / 地震

Outline of Final Research Achievements

We clarified landslide behavior during earthquakes through seismic observation and tremor observation. The resonant frequency of the landslides had positive correlation with topography and/or geological settings of landslides.
We also had multi-sensor observations on landslides to grasp the relationship between seismic ground motion and landslide deformation or displacement. In the filled slope, the amount of pore water pressure increase had strong correlation with peak ground acceleration and velocity that the landslide experienced. In the coastal landslide, the acceleration which is necessary to move the landslide became smaller as the landslide got unstable.

Free Research Field

斜面地震学

Academic Significance and Societal Importance of the Research Achievements

現在おこなわれている地すべりの地震時の安定性評価においては、一定の水平加速度が地すべりに一様に働くことと平常時の強度パラメータを仮定する。本研究における地すべり地における地震や傾斜の観測から、地すべり内での地震動の空間的な多様性や、末端浸食などの外的要因による安定性の低下が明らかとなった。このような知見を活用することによって、より高度な地震時地すべりの安定性評価が可能となり、それに対する適切な対策計画を立案することにつながる。