Abstract
This paper investigates the influence of opening at side wall on the members of existent cut-and-cover tunnels by means of 3D FEM. The calculation results obtained by 3D FEM was compared with those by 2D frame analysis under the condition that there is no opening at side wall. The influence of opening was investigated based on 3D FEM. The calculation results revealed the change of sectional forces near the opening and the influence of opening width on the values of sectional force. The applicability of conventional methods with 2D frame analysis and 2-direction slab method was also investigated by comparing with the results of 3D FEM.
