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| Lateral displacement and uplift of the subway station near the free face in liquefiable soils |
| HU Jilei1,2, ZHANG Zhen2, YANY Bing2
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1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges University), Ministry of Education, Yichang 443002, Hubei, China;
2. College of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002, Hubei, China |
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Abstract To study the effects of different heights of the free face, seismic intensity, subway station burial depth, and horizontal distance from the station to the free face on the subway station in liquefied soil under bidirectional earthquake action, the finite element-finite difference coupled numerical method was used to analyze the seismic response characteristics and laws of the station structure near the free face in liquefiable soils. The results showed that: the existence of the free facewould cause the horizontal displacement and rotation of the subway station, and the accumulation and dissipation of the excess pore water pressure would make the subway station float up first and then settle down; the horizontal displacement, inter-story displacement angle, and settlement after pore pressure dissipation of the structure gradually increased with the increase of seismic intensity and free face height but decreased with the increase of horizontal distance between the station and the free face and the buried depth of the structure; the existence of the free face would reduce the floating of the subway station at the end of the earthquake, and the degree of reduction increased with the increase of the free face height but decreased with the increase of the horizontal distance between the station and the free face;the internal force of the wall near the free face of the structure was smaller than that of the non-free side wall, and the internal force difference increased with the increase of the free face height; increasing the buried depth of the subway station and the horizontal distance from the free face could effectively reduce the adverse effects of the free face on the structure.
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Received: 04 August 2023
Published: 20 September 2023
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