Vibration isolation characteristics of wave impeding blocks in mitigating vibrations induced by 350 km/h high-speed trains moving in underground tunnels

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (20) : 45-53.

WU Zaixin1，YUAN Zhe2，YANG Jianjin2，QU Shuai2，LOU Panming2，YANG Jizhong3，ZHU Shengyang2

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Abstract

he increasing speed of underground railways necessitates posed higher demands for controlling train-induced environmental vibrations. This study focuses on the vibration issues induced by trains running in tunnels at 350 km/h. Utilizing the vehicle-track coupled dynamics theory and finite element methods, a prediction model for train-induced vibrations in underground railways was built and subsequently validated through on-site vibration tests. The study comprehensively examines the influence of the width, depth, and material properties of wave impeding blocks (WIB) on vibration isolation performance. Results indicate that installing horizontal WIBs in the soil above tunnels significantly reduces ground vibrations caused by train movements. Notably, WIBs positioned close to the vibration source offer prominent isolation effects for vibrations above 5 Hz. The width and depth of the WIB directly correlate with its vibration isolation capability, though excessive dimensions may amplify distant ground vibrations. Among evaluated materials, porous polystyrene WIBs outperform rubber, fine sand, and C30 concrete in terms of vibration isolation, especially within the 5-200 Hz frequency range.

Key words

High-speed railway / Wave impeding block (WIB) / Train-induced ground vibration / Wheelset dropping test / Vibration control.

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WU Zaixin1, YUAN Zhe2, YANG Jianjin2, QU Shuai2, LOU Panming2, YANG Jizhong3, ZHU Shengyang2. Vibration isolation characteristics of wave impeding blocks in mitigating vibrations induced by 350 km/h high-speed trains moving in underground tunnels[J]. Journal of Vibration and Shock, 2024, 43(20): 45-53

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