ABSTRACT
The evolution of tunnel boring machine (TBM) techniques enables challenging tunnels to be constructed to the highest safety levels in a fast and efficient manner. However, the construction of cross-passages can impact both safety and productivity by introducing equipment and operations that can obstruct TBM logistics, like the temporary reinforcement elements to the openings of the already lined tunnels. This paper describes how these issues have been addressed during the design of the 41 cross-passages on the Sydney Metro West CTP. It details the solution implemented at openings with inline shear keys connecting radial joints of the segments and the improvements of the gallery design with the optimization of rock support process, geometry and structures based on close interaction with the construction team and with the key assistance of the digital tools. Finally, the paper shows how the tunnels were successfully constructed and the results obtained during the instrumentation and monitoring.
