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<p>Most previous studies have investigated the seismic performance of subway stations in clean sands. However, naturally deposited sands are always mixed with fines, such as clay or silt. The results of laboratory tests revealed that the content of fines significantly influenced the shear modulus and cyclic liquefaction resistance ratio of the host sands. Therefore, the dynamic response and damage mechanism of the subway stations at sand-fines mixture sites deserve more attention. In this study, a series of shaking table tests were conducted to investigate the dynamic response of the subway station structure in the sand-fines mixture liquefiable sites. Different seismic motions with various intensities were applied in the shaking table tests, which represented different spectral characteristics and Arias intensities. The test results reveal that the acceleration response of a soil-structure system is sensitive to the frequency contents between 1 and 5&#xa0;Hz of the input ground motions and that the excess pore water pressure ratio of the sand-fines mixture is dependent on the characteristics of its frequency spectrum and Arias intensity. Moreover, the subway station may float when the soil liquefies, and the weakest parts of the seismic resistance of the subway station structures are the center columns. These results provide reference data for the seismic design of subway stations at sand-fines mixture liquefiable sites.</p>

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Shaking table test on the seismic response of subway station in the sand-fine mixture liquefiable site

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Baoguo Pei,
  • Chuanchuan Zhang,
  • Yimei Cheng,
  • Yifan Xiao,
  • Hongjun He,
  • Xiaojian Xu,
  • Yu Miao

摘要

Most previous studies have investigated the seismic performance of subway stations in clean sands. However, naturally deposited sands are always mixed with fines, such as clay or silt. The results of laboratory tests revealed that the content of fines significantly influenced the shear modulus and cyclic liquefaction resistance ratio of the host sands. Therefore, the dynamic response and damage mechanism of the subway stations at sand-fines mixture sites deserve more attention. In this study, a series of shaking table tests were conducted to investigate the dynamic response of the subway station structure in the sand-fines mixture liquefiable sites. Different seismic motions with various intensities were applied in the shaking table tests, which represented different spectral characteristics and Arias intensities. The test results reveal that the acceleration response of a soil-structure system is sensitive to the frequency contents between 1 and 5 Hz of the input ground motions and that the excess pore water pressure ratio of the sand-fines mixture is dependent on the characteristics of its frequency spectrum and Arias intensity. Moreover, the subway station may float when the soil liquefies, and the weakest parts of the seismic resistance of the subway station structures are the center columns. These results provide reference data for the seismic design of subway stations at sand-fines mixture liquefiable sites.