SEISMIC DESIGN OF THE STATIONS AND THE INTER-STATION TUNNELS OF A METRO-LINE IN SOFT GROUND: A CASE STUDY

The seismic design of underground structures is controlled by ground deformation and soil-structure interaction, whereby kinematic effects dominate over inertia effects. Available methods of numerical analysis for the 2D response in the transverse direction are applied for a case study referring to the stations and the inter-station tunnels of a metro-line in a seismic region. Two continuum approaches are considered: quasi-static and time-domain dynamic finite-element analyses. Sectional forces are determined for a typical earthquake shaking. They are compared against each other and to those obtained from the static design of the excavation support.