Static seismic design coefficients for tailings dam stability studies for Chilean subductive intraplate earthquakes

Abstract

The progressive advance of sophisticated numerical models to represent the behaviour of dams has displaced simplified static analyses and has given more credibility to dynamic analyses. However, the current Chilean regulation DS248 of SERNAGEOMIN that defines the necessary analyses to guarantee the stability of these structures still requires both analyses. When the source of the design earthquake is interplate, the expressions to determine the static seismic coefficients have given consistent results when determining the safety factors  and comparing with dynamic analysis, unlike what has been seen for the intraplate case where the safety factors have been more conservative. In this work, a new different expression is proposed for Chilean  intraplate earthquakes derived on a concept of iso destructive potential, which allows better coherence between both  analyses.