SEISMIC RISK EVALUATION OF IRRIGATION TANKS: A CASE STUDY IN IBIGAWA-CHO, GIFU PREFECTURE, JAPAN
Keywords:
Residual strength parameters, Bromhead ring shear apparatus, Multistage procedure, Earthquake, Newmark methodAbstract
Landslides are one of earth’s most serious types of natural disasters and they are often induced
by earthquakes. Predicting the approximate landslide displacements caused by earthquakes is helpful for
assessing earthquake hazards and for designing slopes to withstand future seismic shaking. In this research, the
authors firstly focus on obtaining the residual strength parameters and the peak strength parameters by
multistage procedure with the Bromhead ring shear apparatus, which are used in the slope stability analysis.
The maximum vertical settlement (MVS) of a slope is determined by the Newmark method using representative
data from three earthquakes, i.e., Great Hanshin Earthquake, Chuetsu Earthquake and Iwate-Miyagi Nairiku
Earthquake. It is experimentally demonstrated that the MVS is very large in both Tanigumi Pond and Sugo
Pond. Once a great earthquake occurs, the progressive failure phenomenon appears and people living in the
area will be in danger. The results presented in this paper can be applied to future landslide hazard assessments
and used to promote reconstruction efforts by the government in the affected areas and for future disaster
prevention and mitigation.