Slope Stability under Seismic Impacts
Z. Z. Sharafiev, V. I. Kulikov
Academician Sadovsky Institute of Geosphere Dynamics, Russian Academy of Sciences, Moscow, Russia
Keywords: Landslides, seismic vibrations, earthquake, Newmark method, slope stability, hydraulic engineering structures, pore pressure
Abstract
This article offers an integrated review of an issue of natural and induced landslide initiation by seismic vibrations created by earthquakes and mine blasting toward systematization of present-day research methods of this phenomenon, including numerical, physical and laboratory modeling. The structure of marine landslides is described, and the mechanics of landsliding under the action of seismic waves and the static stability of sea slopes are disclosed. The approaches to estimation of dynamic stability of landslides, as well as the Newmark method and its modifications are described. It is found that under earthquake-induced vibrations, the critical level of accelerations for a sea slope may reach ~ 0.15 g , which is 2 times lower than for a terrain slope. The stability estimate of sea slopes should take into account the pore pressure. An increase of a pore pressure coefficient from 0.1 to 0.4 decreases the safety factor by up to 50%. The published data on in-situ observations over slope failures under the impact of earthquakes and production blasts are discussed. The impact of multiple seismic effects of earthquakes and mine blasting on slopes of hydraulic engineering structures is described.
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