Study On The Influence Of Surrounding Rock Creep On The Mechanical Properties Of TBM Circular Linning Of Railway Tunnel

In recent years,with the infrastructure construction center moving to the west gradually,a large number of large depth and high ground stress railway tunnels which connecting west and east central regions have been put on the agenda.Under the action of high ground stress,the creep of the surrounding rock often affects the safe operation of the structure.Therefore,it is necessary to study the creep deformation of shield tunnel based on the homogeneous ring model,geological 3D modeling,three dimensional inversion method of tectonic stress field,creep characteristics of surrounding rock in tunnel under tectonic stress field etc.In view of this,the paper based on the technological research and development plan of China Railway Corporation,to research the influence of the mechanical properties of tunnel lining structure under the surrounding rock creep.The main research work is as follows:1.Based on the Burgers creep model,the analytical solution of the displacement of the tunnel under the condition of both the hole and the lining is given.Analysis the surrounding rock creep properties under different tunnel face influence coefficient with Gaoligongshan tunnel.2.Based on homogeneous ring model,considering the creep load of Burgers model,using load structure model and layer structure model,analyzed the creep mechanical properties of circular tunnel,comparing the advantages and disadvantages of the two kinds of analysis method.3.Based on beam spring stratigraphic structure model,considering the nonlinear characteristics of lining joint,analyzed the mechanical characteristics under rock creep condition of Gaoligongshan tunnel.4.By using multiple regression analysis principle,base on the geological 3D modeling,considering the self weight stress field,the horizontal compressive stress field,horizontal shear stress field and vertical shear stress conditions,the linear regression equation of initial tectonic stress field is obtained.5.Undering the condition of geological 3D modeling,analyzed the influence of displacement of tunnel lining structure under rock creep as tectonic stress condition.