Vibration Reduction Effect of the Shielding Pile Based on Seismic Wave Attenuation in Shallow Underground Spaces

Abstract

Seismic hazards threaten underground structures and subsequently affect surface buildings, making effective vibration reduction measures crucial in shallow underground spaces. This paper proposes a multi-layer shielding pile based on the seismic wave attenuation theory of refraction dispersion and diffraction loss as a new vibration reduction method. By using the dynamic wave interaction between the unique multi-layer structure of the shielding pile and the seismic wave, a shielding area with significant attenuation of the ground motion is formed to achieve the purpose of vibration reduction. The spectral element method (SEM) with high-order source time function and convolution perfect matching layer (PML) is used to simulate the numerical models of shielding piles with different parameters (including background models and excavation models), and the characteristics of ground motion and site effect near shielding piles in various models are analyzed. The study reveals the control effect and regulation of the material, size, and shape of the shielding pile on its vibration reduction effect, and determines the shielding pile parameters with the best vibration reduction effect. Shielding piles enrich the vibration reduction measures for structures in shallow underground spaces, and provide a new method for preventing seismic hazards under dynamic load.

Keywords

vibration reduction / seismic wave attenuation / shallow underground space / seismic hazards / ground motion / engineering geology

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