Abstract
The excavation of Marão tunnel, located in the Northeast of Portugal, started simultaneously from both portals (East and West). The same method of excavation (Drill and Blasting—D and B), similar procedures for blasting and the primary support applied was the same and equivalent equipment used on both sides. Considering the same period of excavation, on the East side were excavated 2,300 m, while on the West side the excavation just 1,350 m were excavated. This differential on excavation between both sides of the tunnel, make it necessary to evaluate the causes that could justify this abnormal difference in excavation rates. To determine the cause of this difference in productivity, it was analyzed the geological features, the result of rock mass classifications and the geotechnical characteristics of the rock masses, which could influence the behavior of the excavation. Using descriptive statistics and multivariate analysis of data, applied to rock mass characteristics in each side of the tunnel, was possible to verify the existing differences, as well as the characteristics of the rock mass with greater relevance in the description of the geotechnical zoning for each side of the tunnel.
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Acknowledgments
The authors acknowledge the Infratúnel authorization to use of data collected during the technical assistance of tunnel excavation, without which it would be impossible to develop this article.
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Olivença, P., Santos, V. (2015). Geological and Geotechnical Difference on Both Sides of the Same Tunnel. In: Lollino, G., et al. Engineering Geology for Society and Territory - Volume 6. Springer, Cham. https://doi.org/10.1007/978-3-319-09060-3_8
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DOI: https://doi.org/10.1007/978-3-319-09060-3_8
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