Complete Set of Deformation Control Technology for Subway Ultra-deep Foundation Pits
The subway foundation pit is a four-story underground structure with a maximum depth of 33.2 meters.The exposed strata in the foundation pit mainly consist of miscellaneous fill soil,silty clay,and silty sand,and the strata are rich in slightly pressurized water.There is an operating subway line near the western end of the foundation pit,and a 220 kV overhead high-voltage line and U-shaped groove road passage on the north side.In order to effectively control the surface settlement of the foundation pit,protect the safety of surrounding buildings and the foundation pit itself,the foundation treatment method mainly adopts TRD groove wall reinforcement,cement soil skirt edge,and foundation pit strip reinforcement to improve the soil layer.The 1 200 mm thick underground continuous wall and internal support system,supported by a locally applied axial force servo system.The technology of on-demand precipitation and backup recharge well drainage.All these solutions effectively control the deformation of the foundation pit.
ultra-deep foundation pitcement soil improvement of geological strataon-demand precipitationcontrol deformation
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