The Research Of Deep Foundation Support System And Excavation For Subway Tunnel

ABSTRACT:Subway station deep excavation is an important issue in subway construction, the structure of deep foundation pit deformation on-site monitoring and optimization of important engineering applications.In this paper, No.15, Beijing Subway Line 3, marked out section of Xiangjiang North Road station Line range of deep foundation engineering backed by theoretical analysis and the method of combining on-site monitoring of deep excavation of the deformation mechanism of the MTR were analyzed by analysis of monitoring data, the retaining structure in deep foundation pile deformation envelope to complete the excavation process of MIDAS/GTS simulated and foundation deformation, simulation results are in agreement with the on-site monitoring.Through the establishment of three-dimensional model to analyze the stability of the foundation factor, and on this basis for structural optimization, on the other hand, according to the measured data of the enclosure to optimize the design of reinforced concrete piles study, by optimizing the research around re-reinforced piles, reduce project cost.In the deep excavation, due to the uncertainty of the formation parameters and the establishment of stratigraphic complexity of the constitutive model of the various simplified soil retaining structure with various features of the actual deformation and deformation characteristics of the design phase of the theory often large gap. View of this, the MIDAS/GTS numerical simulation program and out of Beijing subway station Xiangjiang North Road, Section Line deep excavation of the site and monitor data together, by constantly modify the model so that the model is consistent with excavation when the actual situation. Meanwhile, the final adjusted using the three-dimensional model were simulated deep excavation was arrived at by the other three different excavation methods of the monitor pile Ti horizontal deformation, use this as the future of Deep Foundation Pit Excavation Beijing The theory of construction basis.