ABSTRACT
The continual improvement of the tunnelling industry has led to new tunnels constructed in more challenging environments. The radial joints of segmental tunnel lining are now required to endure increased load demand from deep tunnels in rock with high external water pressure to extremely shallow tunnels in soft seismic prone ground. This paper will review the advantages offered by a convex-convex radial joint and identify reasons a designer should consider adopting it over flat-flat. An approach for assessing the bearing & bursting capacities and how guide rods can continue to be utilized is presented. Finally, the implication of the increased joint rotation on gasket performance is discussed.
