Geological challenges of Brisbane’s Cross River Rail project

The Cross River Rail project includes a new rail line in Brisbane, comprising surface rail and station upgrades, twin running tunnels and four new underground stations at Boggo Road, Woolloongabba, Albert Street, and Roma Street. This project has provided valuable insights into the geological conditions of the Brisbane CBD through large-scale investigation and construction activities. This paper presents case studies of particularly challenging ground conditions encountered during the project, emphasizing the need to consider geotechnical variability and uncertainty in the design phase, as well as the verification of these conditions during construction. The findings presented may serve as a reference for future ground engineering projects in Brisbane.