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Numerical Simulation and Field Monitoring Analysis for Deep Foundation Pit Construction of Subway Station

Structural Durability & Health Monitoring 2022年第4期16卷 397-416页

作者： Longyu Zhang Jiming Zhu Department of Resources and Civil Engineering Shandong University of Science and TechnologyTai’an271019China

To investigate the effect of deep foundation pit excavation on the stability of retaining structure, a subway stationin the city of Jinan was selected as a project, and a FLAC3D-based three dimensional model was developed fornumerical simulation. The horizontal displacement of the retaining structure, the axial force of the support, andthe vertical displacement of the column were studied and compared to the collected data from the field. The findingsindicate that when the foundation pit is excavated, the maximum deformation of the retaining structure progressivelydecreases from the top, the distortion of the retaining structure gradually rises, and the final maximumdeformation is around 17 meters deep. In each layer of support, the largest axial force support is located in thefirst reinforced concrete support;the uplift of the pit bottom caused by soil unloading plays a primary role in thevertical displacement of the column, and the column exhibits an upward trend under all construction *** compared to the measured data, the generated findings are comparable and the fluctuation trend is extremelyconsistent. The findings of this article may give technical direction for the development of subway stationswith a comparable engineering basis.

关键词： Subway station deep foundations pit numerical simulation field monitoring maximum horizontal displacement

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