Abstract
Two centrifuge shaking table tests were carried out to investigate the seismic response of a subway station structure in liquefiable interlayer site. For the centrifuge shaking table test of underground structures, there is no precedent for the model preparation of the liquefiable interlayer site for reference. In the paper, some model making techniques were proposed for the liquefiable interlayer site, including the preparation of liquefiable interlayer site (clay consolidation, sand saturation and assembly of interlayer site), structural waterproof treatment, releasing initial pore pressure in the sand layer during centrifugal loading. The model tests obtained ideal results, which achieved the experimental goal of studying the seismic response of subway station structure in liquefiable interlayer site. The research conclusions are as follows. The vertical inertia effect of the overlying soil could significantly increase the axial pressure on the columns of an underground frame structure and then, reduce its horizontal deformation capacity. The columns are the weak components of a subway station structure, which are easy to be damaged under earthquake. The ends of a column are the vulnerable parts and were prone to damage. The classification standard of the limits of relative displacement ratio for underground structure proposed by Du et al. (Du et al. in Earthq Eng Struct Dyn 50:655–672, 2021) is reliable and can provide a method for earthquake damage response evaluation of an underground structure.
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Acknowledgements
This research was supported by the National Key Research and Development Program of China (No. 2018YFC1504305), National Natural Science Foundation of China (No. 52078020).
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Yan, G., Zhang, Z., Xu, C. et al. Centrifuge shaking table tests on a subway station structure in liquefiable interlayer site. Acta Geotech. 19, 1687–1706 (2024). https://doi.org/10.1007/s11440-023-02005-0
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DOI: https://doi.org/10.1007/s11440-023-02005-0