Study On The Deformation Laws Of Retaining Structure Of Deep Foundation Pit Of Subway Station

The study on the deformation of enclosure structure of deep subway station pit is one of the significant subjects in urban subway station construction. To research the deformation of enclosure structure in deep subway station pit, by using the methods of field monitoring and numerical simulation, is mostly significant to guide the design and construction of enclosure structure in deep subway station. In addition, in the design of retaining structure of foundation pit, the deformation parameter of soil value “m”, pre axial force of steel support and support stiffness has a very important influence on the deformation of enclosure structure of foundation pit. In this paper, based on the enclosure structure of Yu Liang Road Station of Tianjin Metro Line 6, the deformation and its influence factors of enclosure structure of deep subway station pit in Tianjin area is studied on by using the combined methods of field monitoring numerical simulation and software of foundation pit design.(1) This article designed the monitoring scheme of the deep foundation pit engineering of Yu Liang Road Metro Station, and the field monitoring for the deformation of the support structure was also finished. Based on the processing of the monitoring results, the deformation changes of underground continuous wall, which is the enclosure structure of the deep foundation pit of subway station, were preliminarily analyzed.(2) In this paper, three dimension model was established by the finite element analysis software MIDAS GTS for this deep foundation pit of Yu Liang Road Station. The displacement of the enclosure structure wall was calculated and analyzed combined with the actual situation of the construction of foundation pit. And then, the wall calculation results were compared and analyzed with the field monitoring results in order to get a better understanding of the deformation of the subway station deep foundation pit, which provides a reference for the design and construction of retaining structure of deep foundation pit of subway station in Tianjin.(3) Making use of the deep foundation pit design software of Li Zheng, the effect of the deformation parameters of soil –?m?, pre axial force of steel support and the steel support stiffness on the deformation of the retaining structure of deep foundation pit of station, was analyzed. The analysis results showed that the greater the deformation parameters of soil –m, pre axial force of steel support and the steel support stiffness, the smaller the deformation of the enclosure structure.The results of this study provide useful theoretical guidance for the design and construction of similar subway deep foundation pit engineering in Tianjin.