Abstract
At present, there are many studies on the dynamic response of overlapped tunnels, but most of them are through numerical simulation. Very few has been conducted by the experimental model research and frequency domain analysis. Combined with the model test and the numerical simulation, the dynamic response of the tunnel lining structure under the action of different train speeds and different tunnel clear distances are investigated, which can remedy the deficiencies in the relevant fields and verify the accuracy of numerical simulation results. The results show that as the train speed increases, the amplitude of the energy spectra of the vibration loads decrease significantly. The tunnel response at the sidewalls is smaller than that at the tunnel crown and at the invert in the lower tunnel. As the net distance increases, the amplitudes of the acceleration frequency spectrum and the energy spectra of the lower tunnel decrease, but with a diminishing rate. The dynamic coefficients of circumferential of the upper tunnel under a train load are larger than those in the longitudinal direction in the invert.
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Acknowledgements
Financial support for this work provided by the National Key R & D Program of China (Grant No. 2016YFC0802205), and the National Science Foundation of China (Grant No. 51278425 No. 51678500 and 51678499) is gratefully acknowledged.
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Yan, Q., Zhang, J., Chen, W. et al. Analysis on the Dynamic Responses of an Overlapped Circular Shield Tunnel under the Different Vibration Loads. KSCE J Civ Eng 24, 3131–3144 (2020). https://doi.org/10.1007/s12205-020-2001-2
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DOI: https://doi.org/10.1007/s12205-020-2001-2