ABSTRACT
The paper describes the use of the finite difference method for the modeling of segmental lined bored tunnels undergoing successive changes in the load conditions. For this purpose, the simulation of the particular case where two bored tunnels are driven through a partially excavated cut & cover station box is carried out. Diaphragm walls are assumed as the retaining structure of the box and are installed before the passage of the bored tunnels. After the tunnels are driven through the station and the lining installed, the excavation within the box proceeds, changing considerably the ground stresses around the segmental tunnel lining. In a typical construction scenario, these tunnels would have to be save and functional since their would be used for operational works, such an the transport of muck from the excavation face, as the excavation works within the station advances. The modeling presented in this paper includes a detailed assessment of the section forces and the overall tunnel stability required for the structural check of the segmental tunnel lining.
