Study On The Deformation Law Of Retaining Structure With Monitoring And Numerical Simulation In Zhongshan Park Of Wuhan Subway Station Foundation-Pit

The study on the force and deformation law of enclosure structure in deep subway station pit is one of the important subjects in urban subway station construction. It is most valuable to research the Deformation Rule of enclosure structure in deep subway station pit, by using the methods of field monitoring and numerical simulation.Based on the Zhongshan Park Station of Wuhan Subway branch 2, the force and deformation law of enclosure structure of deep subway station pit are studied on with the methods of theoretical analysis, in-situ monitoring and numerical simulation in this article.The main jobs and conclusions are as follows:(1) This article described the main features of foundation pit structure and the deformation rules in urban subway station construction,and analysed the inner and the external influence factors.The results show that the main affection factors include supporting conditions,the stiffness and the depth in the dust of underground continuous concrete wall,engineering geology and hydrology geology,construction procedures and construction circumstance.(2) Designed and accomplished the in-situ monitoring plan of the force and deformation law of retaining structure in deep foundation-pit.According to analyzing the in-situ monitoring data,this paper researched the deformation and reinforcement stresses laws of underground continuous concrete wall,and the variation of supporting axial stress.The results indicates that there was a great influence of Time-space effects on the deformation of retaining structure of foundation pit.Installing the supporting steel pipes in time and accepting reasonable lay-out of construction access can effective control the deformation of retaining structure.(3) The two-dimension elastic plastic finite element analytical model was established for this deep excavation pit,and according to the actual conditions in work-site,The stress and deformation of underground continuous concrete wall and the supporting axial stress are calculated and analyzed by plate finite element method.Finally, according to compared with field monitoring data of the horizontal displacement of retaining structure,some conclusions and suggestions are proposed for the design and construction of deep foundation-pit in urban subway station.