第二東名高速道路トンネル掘削工法と支保構造に関する一考察

抄録

For long tunnel construction in the New Tomei Expressway Project, TBM (Tunnel Boring Machine) has been utilized for excavating pilot tunnel before excavating whole section. It is planned to be applied for nine tunnels (47km in length). As of March 2002, 30 km of pilot tunnel excavation by TBM and 9km of whole sectional excavation has been completed. In this paper, mid-term evaluation for the TBM pilot tunneling method as well as tunnel support system with high strength material based on the result of the construction work completed so far.