ORIGINAL RESEARCH article
Front. Phys.
Sec. Interdisciplinary Physics
Volume 13 - 2025 | doi: 10.3389/fphy.2025.1643353
Attenuation of Rayleigh waves by a combined periodic open trench-wave impeding block vibration isolating barrier considering tunnel influence
Provisionally accepted
- Gansu Forestry Voctech University, Tianshui, China
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To address the problem of narrow bandwidth of traditional open trench and wave impeding block vibration isolation barriers, and to consider the influence of existing tunnel scattering effects, a periodic open trench-wave impeding block joint vibration isolation barrier is proposed in this study. The synergistic mechanism of Bragg scattering and local resonance is combined to realize the broadband attenuation of Rayleigh waves. Based on the plane strain model of the tunnel-barrier coupling, the floquet periodic boundary condition and finite element method are introduced to systematically reveal the band gap formation mechanism and parameter regulation law under the multi-physical field coupling. The study shows through the frequency dispersion analysis that the periodic open trench-wave impeding block unit forms a triple bandgap in the range of 11.3~67.3 Hz, which covers the main frequency bands of seismic wave and environmental vibration, and broadens the vibration isolation bandgap. The depth-to-width ratio of the trench dominates the low-frequency bandgap expansion and the mid-to-high-frequency bandgap stability by adjusting the stiffness of the unit cell and the Bragg scattering efficiency, respectively; the material parameters of the wave impeding block have a weaker influence on the bandgap, which verifies the design strategy centered on geometry optimization. The enhancement effect of tunneling on the vibration isolation performance in the mid- and high-frequency bands is further quantified by comparing the transmission attenuation coefficients with the displacement cloud: the tunnel scattering leads to the secondary reflection of elastic waves and phase cancellation interferences, which enhances the peak difference in transmission attenuation by 46%.
Keywords: Periodic combined barrier, Open trench, Wave impeding block, Vibration isolation performance, Rayleigh waves, broadband vibration isolation
Received: 08 Jun 2025; Accepted: 17 Sep 2025.
Copyright: © 2025 Hou, Pei and Li. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Junhua Pei, 18093859330@163.com
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