Abstract
A considerable number of in situ permeability tests in flysch are processed to a depth of 120m with a good spatial distribution. The distribution of permeability values for the different litho-types of this formation, their comparison and their decrease with depth is discussed. The depth where a permeability of 3 to 5×10−7m/sec can be retained (the limit of a reasonable grouting under a high dam) may be twofold if the geological history of the formation could not contain a compressional tectonic process. This depth may reach 100m in some cases. The differences in the mean values of permeability among the various litho-types are minor, while the presence of siltstones, always present although with varied participation, dramatically controls the global permeability.
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Marinos, V., Fortsakis, P., Prountzopoulos, G. et al. Permeability in flysch — Distribution decrease with depth and grout curtains under dams. J. Mt. Sci. 8, 234–238 (2011). https://doi.org/10.1007/s11629-011-2108-5
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DOI: https://doi.org/10.1007/s11629-011-2108-5