Vibration isolation method based on local resonance mechanism for near-field piling in rail transport

Abstract

Environmental vibration from rail transit significantly impacts the lives and livelihoods of people in adjacent areas. This paper proposes a four-component near-field piling vibration isolation method for rail transit based on the local resonance mechanism. It aims to address the issue of the limited distance between certain buildings and the vibration source, as well as the size constraints of piling in traditional isolation schemes. Firstly, the dispersion curve of the four-component periodic structure is derived using the plane wave expansion method, and the factors influencing the attenuation zone of the pile wave barrier are analyzed. Next, the effect of pile row count and pile length on the vibration isolation performance of the wave barrier is evaluated using a three-dimensional finite element model. Finally, the vibration isolation efficiency of the four-component periodic pile method is compared with that of the three-component and two-component methods. The results indicate that the vibration isolation effect of wave barriers improves with an increase in pile rows and lengths. Through comparison, it is found that the four-component periodic pile method exhibits higher vibration isolation efficiency than both the three-component and two-component periodic pile methods when wave barriers of comparable size are used. This approach reduces the required size of wave barriers and presents a novel solution for the vibration isolation in near-field rail transit piling.