Numerical Investigation of Ground-Borne Vibration Mitigation by Infilled Trenches in a Poroelastic Half-Space Considering the Moving Water Table
Publication: International Journal of Geomechanics
Volume 21, Issue 10
Abstract
The moving water table would vary soil layering and may significantly affect the isolation efficiency of wave barriers. A two-dimensional finite-element model is then developed using COMSOL to study the influence of the moving water table on the isolation efficiency of an in-filled trench. The effects of soil hydraulic properties, fill material characteristics, and geometrical parameters of the trench are investigated in detail. Numerical analyses show that a low permeability of poroelastic soil, which shows low-frequency behavior, would significantly reduce the screening performance of barriers. A resonance in stiff barriers may occur as the impedance ratio increases, resulting in worse isolation efficiency. Placing soft trenches in vibration-weakening zones results in worse screening effectiveness, while it is the opposite for stiff barriers. A single stiff barrier can hardly achieve a significant screening performance at the critical water table (Hc) because of the resonance in the dry layer. However, mounting a horizontal plate above Hc would efficiently mitigate the adverse effect of the resonance and improve the isolation efficiency of barriers.
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Acknowledgments
Much of the work described in this paper was supported by the National Basic Research Program of China under Grant No. 2014CB049101. The authors would like to greatly acknowledge this financial support and express the most sincere gratitude.
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International Journal of Geomechanics
Volume 21 • Issue 10 • October 2021
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© 2021 American Society of Civil Engineers.
History
Received: Apr 8, 2020
Accepted: May 17, 2021
Published online: Jul 30, 2021
Published in print: Oct 1, 2021
Discussion open until: Dec 30, 2021
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