Analysis on the Deformation of Foundation Pit Excavation in Deep Sandy Soil Stratum Adjacent to Subway Tunnel
The excavation depth of a deep foundation pit project in Nanjing is 11 m,which is close to the existing subway section.The excavation depth range is mainly silty fine sand layer,which is rich in water and has high requirements for surrounding environmental protection.In order to analyze the deformation of foundation pit excavation and its influence on the surrounding environment,this paper uses Midas 3D finite element software to simulate the whole process of foundation pit excavation and analyze the deformation of foundation pit under various working conditions.The calculation results show that the deformation of the foundation pit is within the allowable value of the design,and the horizontal and vertical deformation on the subway side is small and within the allowable value range.The monitoring data of the whole construction process show that the measured value is within the allowable range,which meets the protection requirements of the enclosure structure itself and the subway tunnel.The successful implementation of the supporting scheme provides an effective reference for the design and construction of similar deep sandy soil stratum.
deep sandy soil stratumdeep foundation pitadjacent to subway tunnel3D finite element analysis