Report on Newmark Sliding Block Analysis
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Pseudostatic method of analysis provides an index of stability (FoS) but no information on deformations associated with slope failures
Pseudostatic FoS varies throught an earthquake
Newmark considers behavior of slope when Fos is less than 1.0 i.e. the potential failure mass is not in equilibrium
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The yield coefficient, ky, is the horizontal pseudostatic coefficient that will produce an FoS of 1.0.
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Accuracy of a sliding block analysis depends on the accuracy of the input motion
Since the potential failure mass is assumed to be rigid, the ground motion at the level of the failure surface should be considered
In-phase – for slopes with very stiff soils and/orsubjected to low-frequency motion
Out-of-phase – for slopes with softer slopes and/or slopes subjected to higher frequency motion.
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