Vibration-Reducing Metastructures in Subway Adjacent Environment Considering Transverse Isotropy of Soil

Abstract:

Vibration-reducing metastructures based on the periodic band structure theory have received extensive attention due to their bandgap characteristics. Among them， the locally resonant bandgap is of great significance for small-scale structures to achieve low-frequency vibration reduction and isolation， which has been applied to surface wave and body wave attenuation and isolation of ground soils. However， most of the current research focuses on isotropic soils. In this paper， considering the transverse isotropy of the ground soil， the vibration reduction and isolation characteristics of the two-dimensional rubber-concrete metastructures for subway vibration are studied. The effects of concrete radius， rubber thickness， and soil anisotropy on the omnidirectional bandgap of metastructures are comparatively discussed， based on which， the different directional transmission and full-scale transmission models are established. It is verified that the elastic waves can be effectively attenuated within the bandgap frequency of the metastructures. This paper explores the influence of soil anisotropy on the performance of vibration-reducing metastructures， which can provide reference and guidance for the design and analysis of vibration reduction and isolation in the vicinity of subways.

Key words:transverse isotropy;subway vibration;vibration-reducing metastructures;band structure theory;transmission