Analysis On The Deformation Of Tunnel Under Construction Of Metro Tunnel

Practice has proved that in the urban construction of the subway is to ease traffic congestion more effective way.Because of the inevitable disturbance of the subway tunnel excavation, it will cause the deformation of the disturbed stratum, the tunnel itself and the affected buildings, which will affect the normal use and safety of buildings.In order to ensure the normal use of the subway construction in the premise of the safe and orderly construction, this paper combined with the actual project case, through the finite element software on the tunnel body and its surrounding rock to calculate and analyze the risk source, and the maximum value of deformation monitoring data analysis,do the following research:(1) In this paper,the mechanism of stratum deformation caused by subway construction interference.On the one hand, from the angle of the original stress state in the formation, this paper expounds the principle of the original stress state variation of the formation, and the main reasons causing the original stress redistribution,by introducing the stress path, the excavation action partition and the law, the paper analyzes the variation of the initial stress in the formation of the tunnel construction;On the other hand, the principle and the main reason of the formation deformation caused by the consolidation of soil are described, and the evolution of the calculation theory of stratum deformation caused by the consolidation of soil is analyzed;In addition, the main influence factors of formation deformation are summarized from the aspects of the formation conditions, the loss and the depth of the buried depth.(2) Using finite element software to numerical simulation of the actual engineering case of risk source analysis and calculation of the project under wear,large roadbed,multi-storey buildings,people yue village stratum deformation caused by the problem of risk source,namely maximum deformation;Analysis in existing buildings under the tunnel vault sink,building settlement and horizontal displacement,build by laying bricks or stones at the beginning of the maximum bending moment and its location.(3) Collect monitoring data,the numerical simulation of risk source location of the monitoring project data analysis,vault subsidence and building subsidence and the excavation face is apart from the distance L of the monitoring sites and the general rule of hole diameter D,and will build by laying bricks or stones at the beginning of horizontal displacement monitoring data of buildings and bending moment compared with numerical simulation data,further verify the feasibility of finite element simulation.