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Plane waves mitigation in saturated porous media using optimal periodic wave barriers
Journal
Applied Acoustics
ISSN
0003682X
Date Issued
2022-11-01
Author(s)
Amanat, Shahab
Gholami, Kourosh
Rafiee-Dehkharghani, Reza
Bansal, Dipanshu
Abstract
Ground vibrations induced by underground transportation, human activities, and earthquakes can damage civil infrastructures. The damage can be more pronounced in saturated soils common in many parts of the world. This paper investigates the optimal design of wave barriers in the fluid-saturated porous media to mitigate body waves using the Bloch-Floquet theory. The primary purpose is to find the configuration of the optimal barriers that provide wide bandgaps for plane waves. Two objective functions are considered by adopting the Genetic Algorithm (GA): maximizing the bandgap width and the relative bandgap at each filling fraction (FR) in a unit cell representing the infinite lattice. The optimal barrier configuration obtained from infinite periodic lattice is subsequently arranged in a more practical finite lattice arrangement. The examination of the optimal finite lattice in both time and frequency domains confirms the obtained bandgaps for the infinite lattice and demonstrates their efficacies in attenuating damaging ground vibrations. Especially, the time domain analyses show that the optimal configurations perform better for S-waves than the P-waves.
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