Tunnel design underneath the operating runway of Incheon airport

摘要

Expansion plans of Incheon International Airport have been developed in phases since its opening.rnConstruction of a newpassenger terminal required a railroad connection to link the existing terminal to a newrnterminal. Since the alignment of railroad connection was chosen to cross the runway in operation, a twin-borerntunnel with a 7.77m outer diameter and 1.15 km length was planned to pass underneath the runway. Additionalrnsettlements incurred by tunnelling in this reclaimed area were predicted and such results were used for decisionmakingrnof tunnel alignment to have sufficient ground cover and to avoid interference with vertical drains. Not torncause any disruption to the airport operations, various risk management strategies were taken into consideration.rnThis paper will prescribe design considerations and settlement risk management as well as construction plansrnincluding a test drive to minimize settlement and to continue operate the airport during tunnelling under thernrunway in use.