Abstract
In this talk, we analyze the attenuation, by a line of local resonators, of guided surface modes propagating in an unconsolidated granular layer. Local resonators are made of dense solid parts added to the granular layer, mobilizing the elasticity of the medium itself for the restoring force and their own mass for the inertia effects. In addition, their weight induces local elasticity changes thanks to the nonlinear elasticity of such unconsolidated granular layers. We show numerically and experimentally that the induced resonance and elasticity change are key ingredients in describing the observed transmission and reflection effects, including mode conversion, for the different guided modes observed. We demonstrate that all these ingredients can be rationally combined to enhance the shielding effect and could be used as strategies to control seismic waves on a larger scale.
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