Numerical Simulation Analysis on the Influence of Precipitation on Envelope Structure of Deep Foundation Pit in Subway Station
Taking Nantong Rail Transit Line 1 as the research object,this paper uses finite difference software FLAC3D to simulate and analyze the impact of precipitation of deep foundation pits in subway stations on the envelope structure.The results show that the final surface settlement is 24.9 mm,and the excavation construction and precipitation of the foundation pit have a great influence on the settlement within0～20.5 m from the edge of the pit;the maximum horizontal displacement of the pile body is 16.1 mm,and the deformation of the pile body can meet the requirements of safe excavation of the foundation pit;after the first precipitation,the maximum settlement occurs at 10.5 m from the edge of the pit.The maximum settlement value of the surface is 24.5 mm at about 5.5 m away from the enclosure pile,while the surface settlement monitoring value is 26.4 mm at the same location.The numerical simulation value of the horizontal displacement of the enclosure pile body is 14.9 mm,and the monitoring value is 16.7 mm.The deformation of the pile body at the third steel support area is consistent with the overall deformation trend.
deep foundation pitprecipitationenvelope structurenumerical analysis
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