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<p>In order to reveal the dynamic catastrophe mechanism of subway station structure in saturated soft soil site, large-scale shaking table tests were conducted on the subway station structure embedded in saturated surrounding soil. Subsequently, based on these tests, coupled nonlinear numerical models of the interaction system were established. The<i> u</i>–<i>p</i> formulation of Biot’s theory was employed to describe the saturated two-phase media. A detailed comparison was made between the simulation results and the shaking table test results to verify the validity of the numerical model, and the potential sources of error were also analyzed. The results demonstrate that: (1) As the acceleration propagates from the bedrock to the ground surface along the soft soil layer, the acceleration amplification factor initially decreases and then gradually increases. (2) An annular peak zone (with a value of 0.5) of the dynamic pore pressure ratio exists around the structure. The underlying soil moves laterally from both sides, which correspondingly causes the ground surface above the subway station to uplift. (3) The time series of the dynamic response indices obtained from the numerical simulations and the experimental tests are largely consistent. The numerical model, which is built upon the mechanical model established using OpenSEES, can reasonably simulate the earthquake response characteristics of the subway station structure surrounded by saturated soft soil during seismic events.</p>

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Seismic Response of Subway Stations in Saturated Soft Soil: Experimental and Numerical Investigation

  • 期刊论文

  • 发表日期：

    2025年4月19日

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  • Xuelei Cheng,
  • Qiqi Li,
  • Ran Hai

摘要

In order to reveal the dynamic catastrophe mechanism of subway station structure in saturated soft soil site, large-scale shaking table tests were conducted on the subway station structure embedded in saturated surrounding soil. Subsequently, based on these tests, coupled nonlinear numerical models of the interaction system were established. The u–p formulation of Biot’s theory was employed to describe the saturated two-phase media. A detailed comparison was made between the simulation results and the shaking table test results to verify the validity of the numerical model, and the potential sources of error were also analyzed. The results demonstrate that: (1) As the acceleration propagates from the bedrock to the ground surface along the soft soil layer, the acceleration amplification factor initially decreases and then gradually increases. (2) An annular peak zone (with a value of 0.5) of the dynamic pore pressure ratio exists around the structure. The underlying soil moves laterally from both sides, which correspondingly causes the ground surface above the subway station to uplift. (3) The time series of the dynamic response indices obtained from the numerical simulations and the experimental tests are largely consistent. The numerical model, which is built upon the mechanical model established using OpenSEES, can reasonably simulate the earthquake response characteristics of the subway station structure surrounded by saturated soft soil during seismic events.