Research on the Planning of the City's U-shaped Dissolving Ditch with a Large,Water-rich Sand Layer for the Deep Foundation Pit Support
Rail lines in major cities are bound to travel through complicated geological locations like karst caverns and grooves with strong karst growth due to the rapid development of these systems.The technical community will face enormous obstacles and very significant construction risks while building subterranean stations in these places.In order to address issues like excessive groundwater drawdown and poor engineering economy,it is necessary to research the design scheme of deep foundation pit support under unfavorable geological conditions like karst growth and rich water thick sand layers.This paper was based on an underground station project in Shenzhen,which was situated in a water-rich sand layer and peat soil in a deep U-shaped karst ditch with strong karst development.The economic performance,karst-confined water control strategies,and foundation pit enclosure structure design were all examined and studied through a combination of theoretical analysis and on-site monitoring.Following the completion of the foundation pit construction,the station's deformation was stable and the foundation pit was free of subterranean water.A suspended horizontal sealing water curtain,drainage,and precipitation measures could be used to effectively control the groundwater level,and serve as a reference for similar engineering construction when excavating a foundation pit in a water-rich and thick sand layer with karst development.
metroU-shaped dissolution ditchkarst confined waterthick sand layerhard bite pilesuspension type water curtain
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