The dock entrance foundation pit of the No.2 dock project of CSSC shipbuilding base is located on Changxing Island in Shanghai,where the geological conditions are typical soft clays.The excavation depth of the foundation pit is 16.0 m,and a compound retaining system of steel sheet pile and bored pile is adopted to form a supporting structure with 5 levels of struts.In order to study the implementation effect and deformation characteristics of the retaining structures during construction,the lateral displacement characteristics of retaining structure during excavation were analyzed based on the monitoring data of the project.Plus,a three-dimensional numerical model was established to simulate the whole excavating process of the dock entrance foundation pit,and the deformation characteristics were compared and analyzed.The research shows that the measured lateral displacement of the foundation pit retaining structure presents an S-shaped due to the large prestress applied to the steel struts.In view of spatial effect,the lateral displacement on the long side of the foundation pit is greater than that on the short side.Furthermore,the lateral displacement of the steel pile is larger than that of the bored pile due to difference in stiffness.By contrast calculations and actual measurements of lateral displacement,the numerical model can well describe the deformation characteristics of the retaining structure of the dock entrance foundation pit,and to some extent reflect the distribution characteristics of inner forces of the retaining structure.
compound retaining systemdock entrance foundation pitmeasured deformationsnumerical simulation
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