Investigation on the Damping Effect of FST System under Moving Load Using the Track–Tunnel-Layered Saturated Ground Model

Yi-Jun Li (), An-Feng Hu, Cong Li, Rong-Tang Zhang, Yu-Xi Ma and Hao Xu
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Yi-Jun Li: School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan 430023, China
An-Feng Hu: MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China
Cong Li: School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan 430023, China
Rong-Tang Zhang: School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan 430023, China
Yu-Xi Ma: School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan 430023, China
Hao Xu: School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan 430023, China

Sustainability, 2023, vol. 15, issue 21, 1-15

Abstract: In this paper, a single-tier beam-spring-damping system and a two-tier beam-spring-damping system are adopted to simulate the FT (fixed track) and FST (floating slab track) system, respectively. The tunnel is modeled as an infinitely long Euler—Bernoulli beam embedded in the layered saturated soil. By solving the governing equations of the saturated soil and employing the TRM (transmission and reflection matrices) method, the frequency response function of the tunnel-layered saturated soil model is obtained. Making use of the interaction between the tunnel and track systems, the track system is coupled with the tunnel-layered saturated ground model. The solutions for the dynamic response of the track system–tunnel-layered saturated ground model under moving loads in the time–space domain are obtained using the inverse Fourier integral transform. To evaluate the damping effect of the FST system on the vibration of tunnel and soil, four damping coefficients are defined and the vibration results of the FT system–tunnel-layered saturated soil model are compared with those of the FST system–tunnel-layered saturated soil under different moving loads and soil conditions. The numerical results show that both the vibration displacement and acceleration amplitude are attenuated after using the FST system, and the damping coefficient of acceleration is about 30% greater than that of the displacement. In addition, the damping effect of the FST system on the ground surface vibration is associated with the embedded depth of the tunnel and the soil stiffness.

Keywords: FST system; layered saturated ground; tunnel; surface vibration; damping effect (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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