Earthquakes and Structures

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Effect of excitation intensity on slope stability assessed by a simplified approach

  • Korzec, Aleksandra (Institute of Hydro-Engineering, Polish Academy of Sciences) ;
  • Jankowski, Robert (Faculty of Civil and Environmental Engineering, Gdansk University of Technology)
  • Received : 2021.03.19
  • Accepted : 2021.09.24
  • Published : 2021.12.25
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Abstract

The paper concerns the selection of a design accelerograms used for the slope stability assessment under earthquake excitation. The aim is to experimentally verify the Arias Intensity as an indicator of the excitation threat to the slope stability. A simple dynamic system consisting of a rigid block on a rigid inclined plane subjected to horizontal excitation is adopted as a slope model. Strong ground motions recorded during earthquakes are reproduced on a shaking table. The permanent displacement of the block serves as a slope stability indicator. Original research stand allows us to analyse not only the relative displacement but also the acceleration time history of the block. The experiments demonstrate that the Arias Intensity of the accelerogram is a good indicator of excitation threat to the stability of the slope. The numerical analyses conducted using the experimentally verified extended Newmark's method indicate that both the Arias Intensity and the peak velocity of the excitation are good indicators of the impact of dynamic excitation on the dam's stability. The selection can be refined using complementary information, which is the dominant frequency and duration of the strong motion phase of the excitation, respectively.

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