Abstract
This work describes the use of geostatistics in permeability data obtained by the Lugeon test at determined depths within boreholes during curtain grouting at a dam foundation. Design criteria often demand a first and a secondary stage of grouting treatment defined by a threshold permeability of 1 Lugeon unit (U.L.), above which there is a need for grouting. That implies, namely, to accurately characterie the permeability spatial variability at the foundation rock mass with minimum data collection. This study aims to assess the advantages of geostatistical modelling of permeability. A secondary goal is to compare the non-geostatistical (traditional) approach and geostatistical interpolation methods to the raw permeability data sets. Both will quantify different foundation zones needing treatment. The obtained model and the corresponding error study was analysed and correlated with the design stage’s geological-geotechnical model. The results show a good correlation between the obtained model and the geological-geotechnical model, pointing out the feasibility as an optimising tool for curtain grouting design at a dam foundation. Furthermore, the cost estimates of activity, time, and materials by applying a traditional empirical approach and a modelling approach to solve it were compared. The latter showed significant enhancement, construction efficiency with reduced costs and construction time, and negligible loss in quality due to residual uncertainty in the models.
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Acknowledgements
VG is grateful for the support of EDP—Energias de Portugal, SA. HIC was supported partially under the Labcarga|ISEP re-equipment program (IPP-ISEP|PAD’2007/08) and Centre GeoBioTec|UA (UID/GEO/04035/2020). We are grateful to the anonymous reviewers for the valuable inputs that helped improve the manuscript focus.
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Gavinhos, V., Carvalho, J., Meixedo, J.P., Chaminé, H.I. (2023). Multiscale and Modelling Hydraulic Properties of Rock Mass Foundations: Decision Tools for Design and Construction. In: Chaminé, H.I., Fernandes, J.A. (eds) Advances in Geoengineering, Geotechnologies, and Geoenvironment for Earth Systems and Sustainable Georesources Management. Advances in Science, Technology & Innovation. Springer, Cham. https://doi.org/10.1007/978-3-031-25986-9_30
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