Laboratory Research of Slope Stability under Impacts
G. G. Kocharyan, S. B. Kishkina, Z. Z. Sharafiev
Academician Sadovsky Institute of Geosphere Dynamics, Russian Academy of Sciences, Moscow, Russia
Keywords: slope processes, landslides, slope failure, multiple impacts, seismic vibrations, earthquakes, blasts
Abstract
The authors discuss the lab-scale studies into sub-horizontal effect of a low-frequency seismic wave on a slope. Acceleration transducers enabled tracing relative slope sliding even in case of invisible straining. It is found that if the maximum acceleration in the momentum is below a certain value governed by the soil strength, the slope keeps stable even at high displacement velocities. A single impact at high acceleration but low mass velocity is also incapable to initiate landslide. However, in this case, residual strains arise, accumulate and can make the slope unstable. Under multiple impacts, the critical parameters are markedly lower as compared with the single impact. This is particularly true for steep slopes having small stability factors. The parameters of vibrations generated by different-magnitude earthquakes which initiate slope failures in the form of landslides are analyzed.
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