Study On The Deformation Laws Of Interior Bracing And Supporting Structure Of Rock Deep Excavation In The Yuan Cun Station Of The Line 21 In Guangzhou

In this paper YuanCun subway station of the 21 st Guangzhou metro is taken as the study of the background. Based on the analysis of layered rock engineering properties, constitutive model, deformation and failure mechanisms. Through the analysis of the actual monitoring data of the project site and finite element numerical simulation,get the results of the deformation of the supporting structure of rock deep pit. Finally, analyzed the the factors that influenced supporting the structural deformation.(1)Describeing the constitutive model and constitutive equations of the layered rock; analysing the engineering properties of layered rock mass(structural characteristics, strength properties, deformation characteristics);the mechanisms of deformation and failure and the impact of them on the supporting structure deformation.(2)Simulating the project by using MIDAS / GTS geotechnical engineering finite element software,analyzing the construction phase of excavation, the results after compareing to the actual monitoring results shows that : the deformation curves of rock excavation structure are basically consistent in both cases, similar to soil excavation, but the maximum deformation of rock excavation is significantly less than the maximum deformation of soil excavation; validating the correctness of the parameter selection and model selection excavation in the simulation process, and the rationality of the structural design, providing value basis for the subsequent deformation prediction of construction pit.(3)Analyzing the influencing of rock excavation structural deformation by changing the parameters of the method In the numerical simulation :the deformation of rock foundation pit structure is mainly affected by the strength of layered rock, retaining wall stiffness and rigidity of the support and other factors.(4)Analyzing the impact of cracks in layered rock foundation pit for rock foundation pit support structure deformation, in the actual engineering, the overload and the excavation will lead to continued development of fractured rock mass, the instability of the rock, which influence the deformation of the retaining structure of foundation pit.