Analysis of the Mitigation Effect of Metasurface on Environmental Vibrations Induced by Rail Transit Vehicle Operation

This paper develops a semi-analytical computational model, based on the Thin Layer Method, to analyze the vibration mitigation effects of a metasurface composed of circular-based resonators on layered soil subjected to vibrations induced by rail transit vehicles. The model considers coupling interactions between the metasurface and the layered foundation, enabling efficient evaluations compared to conventional finite element methods. Parametric analyses reveal that adjusting the resonator array spacing strategically shifts the interference-induced attenuation peaks into targeted frequency bands; specifically, narrower spacing enhances attenuation at higher frequencies, while wider spacing shifts peak attenuation towards lower frequencies. Furthermore, variations in soil properties significantly affect the frequencies at which the primary attenuation peaks occur, emphasizing the importance of considering soil stratification in metasurface designs. The presented framework provides a practical and computationally efficient tool for optimizing metasurface configurations to effectively mitigate railway-induced low-frequency vibrations.