As a part of a much larger CSO program the design of the 23 ft (7m) ID segmental lining for the Blue Plains Tunnel offered significant benefits over traditional two pass systems. However, careful design was required to achieve the 100 year design life and provide structural resistance to an internal pressure that was higher than the external pressures on the lining. This paper describes how these and a number of other requirements were incorporated into the design to provide a ring that performs robustly for functional, cost and constructability criteria. Finally, comments are made on the performance of the ring in the tunnel and recommendations made for future designs.
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