Abstract: Based on the case history of the construction of Beiling Tunnel in the New South Nan Guang Railway Project, this paper introduces the deformation of rock mass and the tunnel linings problems encountered in the excavation of the tunnel as well as the geotechnical hazards such as the slope stability problems induced by the construction of the tunnel entrance and the access road. The environmental impact by the construction of the ancillary system such as the temporary residential areas for the construction personnel has also discussed in this paper.

Key words: Tunneling Project in the Mountain Area, Environmental Geotechnical Engineering, Geological Hazards