Abstract
The dynamic behaviour of cross-tunnel structures under the wheel-rail impact forces of heavy-haul trains is complicated. This paper establishes an impact force excitation input model to simulate the wheel-rail vertical forces of rail welded joints. The calculated results of the correction formula of wheel-rail vertical forces for seamless rail joints are in good agreement with the measured data and meet the accuracy requirements. The present paper describes a 1/50 scale model experiment based on the case of the newly-built Jing-Zhang Railway underneath the existing Tang-Hu Heavy Haul Railway. Numerical simulation analysis uses FLAC3D to simulate the experiments and investigate the dynamic soil pressure characteristics under different factors. The test and numerical results showed that the dynamic responses of the upper tunnel monitoring points are stronger than the lower tunnel, but the maximum vertical settlement of the lower tunnel vault is bigger and prone to damage. As the depth increases, the stress of the surrounding rock interlayer at each monitoring point gradually decreases. In-depth, the surrounding rock stress decreased approximately non-linearly with increasing surrounding rock grade and surrounding rock interlayer thickness.
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The work presented in this study was financially supported the National Natural Science Foundation of China (51878242, 41877218). Their support is gratefully acknowledged.
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Wang, Z., Tao, L. & Dong, J. Analysis on the Dynamic Characteristics of Cross-Tunnel Structures under Wheel-Rail Impact Forces. KSCE J Civ Eng 26, 3978–3991 (2022). https://doi.org/10.1007/s12205-022-2137-3
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DOI: https://doi.org/10.1007/s12205-022-2137-3