Abstract
It is important to establish an effective evaluation method of tunnel lining deformation behavior caused by adjacent construction such as embankment above the tunnel.
In view of such a situation, we carried out parametric studies using 2-D nonlinear FEM program “NATMFEM”. Parameters of the study areas follows: 1) width of the embankment, 2) Overburden of the tunnel before construction of the embankment, 3) rigidity of the tunnel lining, 4)initial rigidity of the sunounding ground, 5) nonlinear characteristic of the surrounding ground And then, based on these parametric studies, we proposed some nomographs for estimation of height of embankment when lining stress generated by construction of the embankment reaches either bending tensile strength or compressive strength of the lining.
