The Deformation Of Pile Foundation Of The Terminal Building's Inclining Arch Structure While Excavating The Nearby Large Pit

The pile foundation of the terminal building's inclining arch structure is located at the side of the railway station pit that is very wide,large,deep and long.and the deformation is quite strict to the pile foundation.For the pile foundation being very closed to the pit,we must take some reinforcement to the soil between them so that the deformation can be controlled effectively.With the background of the pit of Shuangliu airport railway station,which is one of the stations of the Chengdu-Mianyang-Leshan railway,firstly,this paper ansylized how the soil parameter i.e. elastic modulus and Poisson influced the horizontal displacement of the sigle pile,and evaluated the deformation of pile foundation,which is under the static loads when not carrying on excavating.This paper focused on the pile foundation deformation under non-reinforced conditions which draw up by design institution. The three-dimensional finite difference program was applied to establish three-dimensional numerical model, by which the rationality of partly full reinforced construction schema which proposed by design institution was verified. By virtue of the application of arch wall in the foundation pit supporting structure, the soil reinforcement project which adopt arch wall was proposed, and the arch structure was analyzed by bar finite element to select the reasonable parabolic curve as the final rational section form of arch wall. Compared the reinforcement effect of different arch heights, a more reasonable arch wall depth was received. It gave some accordance to the design of similar projects in future.In addition, not only the constricting effect of different reinforcement for horizontal displacement of oblique arch pile foundation was assessed, but also the law of horizontal deformation for support wall on the both sides of foundation pit under different construction conditions was analyzed. Compared the analysis results with on-site monitoring data, it gave a certain guidance to the optimization of excavation support.