Study on Influence of Vertical Position of Steel Bracing in Foundation Pit of Open Cut Railway on Deformation of Envelope Structure

Abstract

The influence of different vertical position of steel support on the retaining structure of deep foundation pit is studied, and the deformation and deformation of retaining pile under multi-supported support conditions are revealed, which provides support design and excavation optimization design for deep foundation pit engineering. in accordance with. Through the calculation of the rational deep foundation pit calculation software and FLAC3D numerical simulation software, the deformation law of the retaining structure under different vertical position of steel support is studied. The research results are as follows: (1) Different vertical positions of the steel support to the retaining pile the deep horizontal displacement of the pile has a great influence. Appropriate encryption of the lower steel support is conducive to the stability of the retaining structure. (2) The influence of the vertical position change of the steel support on the horizontal displacement of the pile top is limited, but the first two supports are vertical. When the position is unchanged, the third steel support is moved down by 1m, which can effectively limit the horizontal displacement of the pile top, which is beneficial to the stability of the retaining structure.