Deformation Monitoring And Stability Analysis Of Shanty Area Under The Shield Tunneling

Based on the research of technical research,theoretical analysis,field measurement and numerical simulation,this paper takes the area under the shield tunnel in Wuhan City Rail Transit Line 8,Deformation law and its stability are analyzed in depth,and the deformation law of stratum soil and upper shanty area under shield tunneling is explored,which provides the necessary reference and reference for the follow-up engineering personnel.The main contents and research results of this paper are as follows:(1)According to the excavation principle of tunnel shield,the mechanical mechanism and geometric effect of soil subsidence under pressure balance are studied,and the influence mechanism of shield tunneling and the corresponding construction control measures are explored.(2)The finite difference software FLAC3D is used to carry out 3D numerical simulation,and the variation rules of surface subsidence and house deformation under different tunnel depths are compared.(3)Combining the different ages and shields,the risk stratification of the shantytowns in the upper part is studied,and the settlement rules of the old shantytowns with poor foundation conditions under complex formation conditions are explored.(4)Taking the shantytowns of Huangpu Road Station and Xujiaping subway area in Wuhan,Hubei Province as an example,the internal force deformation and surface subsidence of both buildings are monitored in the process of shield construction.Influencing factors,and put forward the control requirements which are suitable for the relevant indexes of this project.