Seismic Inspection of Tailings Dams Against L2 Seismic Motion by Slip Deformation Analysis Considering Liquefaction

Abstract

Three tailings dams failed during the 2011 Tohoku Earthquake. The failed tailings dams had been investigated before the earthquake and judged to be stable. Then, it was considered necessary to inspect the tailings dams deemed susceptible to damage by very strong level 2 earthquake motion. And, it was considered necessary to introduce a new design concept based on the likely degree of damage from sliding. Then, it was decided to analyze the amount of deformation using a dynamic analysis method by considering liquefaction, and seismic inspections began to be carried out based on the amount of slip displacement.