Abstract: This paper presents a case history of the application of the construction monitoring of the New Austria Tunneling Method (NATM) support in the Jianchanggou Expressway Tunnel excavation. The monitoring methods applied in monitoring the stability of the rock mass are introduced. A typical section monitoring data are presented in details. The monitoring ensured the stability of the rock mass and the helped in determining the time for the secondary lining support.

Key words: Expressway Tunnels, New Austria Tunneling Method, Monitoring and Surveying, Dada Analyses