The geotechnical characteristics have a significant impact on the design and construction of deep and large foundation pit engineering.In response to technical difficulties such as strong permeability of sandy silt,taking a deep and large foundation pit project in Lingang New City of Shanghai as an example,a detailed comparison and selection of foundation pit enclosure design schemes was carried out in comprehensive consideration of hydrogeology and other factors,and a scheme of SMW construction method piles with reinforced concrete support in the north-south,and east-west directions was proposed,and the measures were adopted including using construction piles to penetrate through silty clay to isolate external hydraulic connections,pre dewatering the foundation pit to 1 m below the bottom,and strengthening monitoring of water level and deep displacement.And then the construction scheme was calculated and reviewed using structural calculation software.Engineering applications have shown that the construction process of foundation pits is safe and controllable,and the displacement of retaining piles and ground settlement meet the requirement of relevant specifications.This support structure scheme is reasonable and effective.The relevant conclusions can provide theoretical guidance and technical support for the design and construction of similar deep and large foundation pit projects.
sandy siltdeep and large foundation pitfoundation pit enclosuredesign scheme comparison and selection
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