In the paper geotechnical characteristics of carbon clay shales from Coal Recovery Plant Haldex-Michał in the aspect of their applicability for hydraulic embankments has been presented. The results of tests aimed at reducing the permeability of this material by admixing with sealing material from postflotation sedimentation ponds are also given. Described clay shales can not be used for construction hydraulic embankments without extra sealing elements due to their high water permeability of the range of 10^-4 - 10^-3 m/s.
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