Influence of the Tunnel Shape on Shotcrete Lining Stresses

Tunnel excavation is frequently carried out in rock masses by the drill and blast method and the final shape of the tunnel boundary can be irregular due to overbreaks. A study of the effect of tunnel boundary irregularity has been carried out in order to investigate the effects of overbreaks . This is done by developing a computational tool able to take into account fuzzy variables such as thickness of the beams of the bedded spring approach used for the model. The obtained results show that irregularity effects should be considered when a shotcrete lining is used as the final tunnel lining in the case where the tunneling procedure does not permit a smooth surface to be obtained. This is crucial to obtain a durable lining.

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