Abstract: Tunnel boring construction of CA450A Project of Taoyuan Internation Airport Access MRT System, is the first time using DoubleOTube Tunnel Boring method in Taiwan. This paper introduces the DoubleOTube tunnel constrution in CA450A Project of Taoyuan Internation Airport Access MRT System, including process of segment produce, management of excavation, description of the problems and solutions. It may provide reference for the construction of similar tunnels in the future.

Key words: DOT tunneling method, DOT tunnel, Double-O-Tube shield machine