Geotechnical Characterisation of the Normanby Fault Zone for Roma Street Station Cavern Design, Cross River Rail, Brisbane.

The Cross River Rail (CRR) - Tunnel, Stations and Development project in Brisbane includes twin tunnel boring machine (TBM) and mined running tunnels and four new underground stations at Boggo Road, Woolloongabba, Albert Street and Roma Street. Roma Street station is located within the Normanby Fault Zone (NFZ) which is a major regional scale fault zone that traverses the Brisbane CBD. Geotechnical characterisation of the NFZ was undertaken for the project to inform the design of the Roma Street station cavern, adits and shafts. This paper presents the development of the geotechnical model at Roma Street station including uncertainty regarding the location and character of the NFZ. It presents the design solutions adopted for the range of ground conditions and summarises observations of the NFZ during construction. This information may be useful for future ground engineering projects in Brisbane. [ABSTRACT FROM AUTHOR]