Review article

https://doi.org/10.17559/TV-20170921112131

Simulation of the Initiation and Motion of Seismically Induced Aso-Ohashi Landslide During the 2016 Kumamoto Earthquake

Xiao Shi ; Mechanics Research Centre, Qingdao University of Science and Technology, No.99 Songling Rd, Qingdao, Shandong, China, 260061
Yujing Jiang* ; Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki, Japan, 8528521

Abstract

To verify the mechanism of Aso-Ohashi landslide which is the seismically induced slope failure triggered by 2016 Kumamoto earthquake, field investigations and numerical simulations with terrain data measured by airborne laser scanners are carried out. A finite difference method (FDM) model is set up by the true terrain data. The stability of landslide region under shear strength reduction method and earthquake acceleration wave input were discussed. The effect of foreshock which caused strength reduction indicated that the critical value of strength was c = 16 kPa and ϕ = 33.87 degree. The earthquake wave made only steeply dipping region unstable and moved, but landslide hardly occurred in gently dipping region. In order to verify that only the steeply dipping region was moved due to earthquake, a GIS (Geographic Information System)-based depth average Bingham model which estimates the movement of slide mass is presented.

Keywords

airborne laser scanning; Bingham model; failure mechanism; finite difference method; Kumamoto earthquake

Hrčak ID:

248257

URI

https://hrcak.srce.hr/248257

Publication date:

19.12.2020.

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