The Deformation Law Research Of Deep Foundation Pit Of Xuzhou Subway Station

Subway station deep foundation pit retaining structure design and its deformation law research is one of the most important steps in the process of construction of the subway station, so, deep excavation in subway station in the process of the excavation deformation law of the research has the important value of engineering application. This article uses the three dimensional finite difference software FLAC3D, considering time-space effect exist in the process of foundation pit excavation, to simulate the process of xuzhou deep foundation pit excavation of the subway station, analysis of foundation pit bottom soil resilience?settlement of surrounding soils?foundation pit supporting axial force?lateral structure of maintenance after each layer of the soil excavation, and compared the simulation results with the results of field monitoring,obtain:At the bottom of the foundation pit rebound width direction into the foundation pit of soil symmetric distribution, with the increase of excavation depth, the springback form by uniform rebound into the middle on both sides of the big small; The ground settlement around the foundation pit is parabolic curve shape, and the maximum ground surface settlement occurs in about 1 times the excavation depth of foundation pit edge location, with the increase of excavation depth, sedimentation value increased gradually, the maximum subsidence point outward migration phenomenon; Brace axial force increases with increasing along with the length of the diagonal brace, and brace axial force significantly smaller than that of straight brace axial force, a maximum of strut axial forces appear within the scope of the foundation pit in central; Foundation pit retaining wall lateral overall trend is between two small, with the increase of excavation depth of lateral quantity will increase, the support set after 2,3, the level of the retaining wall lateral volume continues to increase, but the increasing amplitude was decreased; With the increase of excavation layer thickness, settlement of surrounding soils and retaining structure of foundation pit deformation also will increase, but with the increase of excavation section width, settlement of surrounding soils increase decrease lateral and retaining structure, the two into a reciprocal relationship.