The evolution of permeability hysterisis in Indiana Limestone during application of isotropic confining pressures up to 60 MPa was measured by conducting one-dimensional constant flow rate tests. These tests were carried out either during monotonic application of the confining pressure or during loading-partial unloading cycles. Irreversible permeability changes occurred during both monotonic and repeated incremental compression of the limestone. Mathematical relationships are developed for describing the evolution of path-dependent permeability during isotropic compression.

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The aim of the study was to analyse the enzymatic activity of dehydrogenases, urease, alkaline phosphatase and proteases in post−mining soils. Moreover determined the count of heterotrophic bacteria, moulds, actinobacteria and bacteria of the Azotobacter sp. genus. The research was conducted between 2015 and 2017 in experimental areas of the Pątnów dump, which belongs to the