2- and 3-Dimensional Analyses of Shield Tunnels


Yukinori KOYAMA,
General Manager,
Structure Technology Development Div.,
Technological Development Dept.

Yasushi ARAI,
Engineer, Tunnel GroupC
Structure Technology Development Div.,
Technological Development Dept.

Shinji KONISHI,
Senior Engineer, Tunnel GroupC
Structure Technology Development Div.,
Technological Development Dept.

Noriyuki OKANO,
Engineer, Tunnel GroupC
Structure Technology Development Div.,
Technological Development Dept.



Only a 3-dimensional approach can estimate the effect of tunneling. However, for the sake of simplicity, a 2-dimensional approach which combines some features of the 3-dimensional effect has been applied in tunneling practice. This paper presents some results of 2-dimensional FEM analyses covering the 3-dimensional effect and an elastic, elasto-plastic 3-dimensional one considering the tunneling process of railway shield tunnels. An efficient and accurate assessment of ground movement in shield tunneling is studied.