The 3D FEM Simulation And Experimental Research On Ground Deformation By Shield Driven

Shield tunneling is a main method in the underground tunnelconstruction. But any kind of shield tunneling construction willdisturb the soil around the tunnel line in different degree. Themechanism of turbulence of soil around tunneling line has beeninterpreted in this paper, and the genetic analysis of the turbulence ofsoil around tunneling line also has been made in this paper. And thereason which causes the stress/strain turbulence and the groundsettlement has been interpreted in details in this paper.The finite element method is the main method of tunnel excavating.In this paper, three-dimensional Finite Element Method is applied tostudy the ground deformation by shield driven. According to the realengineering, author bring forward a 3D model to simulate the tunnelexcavating by mean of the general FEM program ABAQUS. The keyfactors such as the soil conditions of Tianjin area, the nonlinearity ofsoil material and the structure void of shield and the interactionbetween the gasket and soil also been taken into account in this 3Dmodel. At the same time, author had measured the horizontal andvertical settlement of soil around the tunnel line on the constructionsite of Tianjin No.1 subway line. Those real engineering data provedthe rationality of the FEM result of this paper. On the basis of this 3Dexcavating model, author computed the displacement of foundationand the concrete piling nearby tunneling line by shield driven, andthose results may apply to the Tianjin subway construction.