1. The document discusses creating a tunnel model using PLAXIS software, including defining the geometry, material properties, and boundary conditions of the tunnel and surrounding rock. 2. A horseshoe-shaped tunnel with a diameter of 5.3m and space of 12m between tunnels is modeled. Rock and shotcrete material properties are input along with standard earthquake boundary conditions. 3. Dynamic analysis is performed by applying a prescribed displacement at the bottom boundary and vertical harmonic load to model an earthquake, with results viewed in output graphs.