Influence of the Tunnel Shape on Shotcrete Lining Stresses |
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Authors: | Fabrizio Barpi Daniele Peila |
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Affiliation: | 1. Department of Structural and Geotechnical Engineering, Politecnico di Torino, Corso Duca degli Abruzzi, Torino, Italy;2. Department of Land, Environment and Geo‐Engineering, Politecnico di Torino, Corso Duca degli Abruzzi, Torino, Italy |
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Abstract: | 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. In order to investigate the effects of overbreaks a study of the effect of tunnel boundary irregularity has been carried out. This is done developing a computational tool able to take into account fuzzy variables (i.e., 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 (for 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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