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  Segmental concrete tunnel lining design for two 6.9 m EPB TBM machines

  Precast segmental linings for shield driven tunnels are designed as both initial ground support and final tunnel lining in modern projects. The parameters of tunnel lining such as dimensions, thickness and strength of materials are related not only to ground-lining interaction, but also to construction conditions. In current case, both conventional steel cage and steel fiber reinforcement were used in segmental concrete lining. The proximity of two 6.9 m EPB TBM machines and the local geology guided the choice of the type of reinforcement used. This paper presents unique technological aspects adopted in the ring design as well as the geological and the track way conditions that have led to some changes unforeseen in the original design.

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