Numerical Analysis of Jablunkov Tunnel Collapse

Jablunkov tunnel is located at the newly renovated track through Jablunkov Pass in Czech republic near Slovak border. The original tunnel was built in 1870. The second tunnel was opened in 1917. When construction was used English modified method of excavation. During the 2nd World War were tunnels damaged. Motion reconstruction allows resetting of the original single-track tunnel to a new modern two track tunnel. Geological conditions were very difficult and the state of both tunnels is unsatisfactory. One of the single-track tunnel was extended about 6 m. The total width of the tunnel is 12,6 m. The tunnel length is 600 m. The excavation carried out in accordance with NATM excavation method. Profile was divided into top heading and bench. During the excavation of bench primary lining collapse the main cause was a marked change in rock.