ABSTRACT
Although tunnels with large cross section, such as tunnels in the Second Tomei and Meishin Highway and two-lane tunnels with sidewalk, have recently increased, their design and construction methods have not been established yet. There are many problems to design and construct such tunnels especially in earth ground. NATM with center diaphragm is one of measures to solve the problems. In this paper, behavior of a tunnel with large cross section in earth ground, which was constructed by applying NATM with center diaphragm, is firstly described, based on the measurement results. Then, a practical finite element analytical method is proposed, to predict behavior of large-scale mountain tunnel with center diaphragm in earth ground.
