Research On Deformation Evolutional Mechanism Of Supporting Piles In Subway Deep Foundation Pit And Security Control

As an indispensable part of city-transportation construction,the foundation pit project is considered by the engineering community as a comprehensive subject with high risk and variability.Pit supporting structure can control the deformation and guarantee the stability of the pit.It is important in controlling construction risk and future pit project development to study its deformation law and security control.Based on the subway foundation pit in metro line 1 of Xiamen,the main works of studying deformation mechanism of supporting piles and security control in this paper is as follows:(1)Based on the supporting piles deformation monitoring data of the city square station deep foundation pit.By means of data analysis and mining,the lateral deformation characteristics of supporting piles under different conditions are analyzed.(2)Based on city square station deep foundation pit,ABAQUS finite element software is used to simulate the excavation,the deformation of deep foundation pit supporting piles with time and depth is studied,and the influence factors of the supporting piles deformation are analyzed.(3)The maximum lateral deformation of supporting piles during excavation is predicted by numerical simulation.The reliability of the prediction model is verified by comparing the measured data.The construction measure of adding one steel supporting is put forward by predicted result.The lateral deformation of supporting piles is controlled effectively,and the foundation pit engineering security control is realized.