The paper aimed at the determination of the influence of saturation on compressibility of minestone from the Rydułtowy-Anna mine an its mixtures with 10, 20 and 30% (by weight) additive of fly ash from the power plant Skawina S.A. The tests were carried out in a medium-size oedometer (d = h = 374 mm), on the samples formed at the optimum moisture content and the compaction index I_s = 0.95, saturated before loading. The results of previous tests conducted on the same but non-saturated samples were taken into consideration in the analysis of the obtained data. It was stated, that the compressibility of the tested materials was relatively small, and in the case of the mixtures clearly depended on the fly ash additive and water conditions. The assessment of the usability of the tested materials for earth structures was also performed.

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