| The foundation pit around the subway station has the characteristics of increasing excavation area and depth,diversification of shape and supporting structure,and the complicated surrounding environment,which have led to the deformation of the surrounding structure as well as the surrounding surface caused by the foundation pit construction.Control is also becoming stricter.Therefore,studying the deformation rules of the retaining structure of the subway station has important significance for the design of the foundation pit construction scheme and the selection of supporting structure parameters.Based on the deep foundation pit in Hangzhou area,this paper conducted on-site monitoring and numerical simulation of the excavation process.This paper firstly analyzes the on-site monitoring data of four foundation pits in Liangzhu Station,Xincheng Road Station,Xinyue Road Station and Xiangxi Road Station in Hangzhou area,respectively,the displacement curve of the ground-connected wall and the maximum horizontal displacement and the maximum horizontal displacement depth.And the maximum settlement of the foundation pit and the variation law of the axial force of the steel support.Then the particle flow PFC2 D simulation software is used to simulate the excavation process of Liangzhu station.The comparison between the monitoring data and the simulation data can be obtained by comparing the actual test data with the simulated monitoring data.The constructed PFC2 D model can be better.Finally,using the particle flow software PFC2 D numerical simulation,theparameters of the foundation pit retaining structure are studied: the insertion ratio of the ground joint wall,the steel support layer distance,the first support position and the depth of the foundation pit affect the stability of the foundation pit,which is the subway in Hangzhou area.Provide reference for the design and construction of the foundation pit of the station. |
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