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  Practical Considerations for the Design of Large Diameter Segmental Linings

  The use of large diameter (greater than 10m) segmentally lined TBM tunnels is becoming increasingly commonplace. This places pressure on the segmental lining designer, who must design for more segments designed for much higher forces, and sometimes more onerous load conditions. While some of the load conditions on large diameter tunnel linings have been described in past literature, many of the practical considerations are not. This paper reflects on the authors’ experiences of the design and construction of several large diameter segmental linings, both conventionally and steel fibre reinforced, and describes the practical considerations the designer must account for in their successful design. Typical solutions to problems are described with examples from past projects.

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