Air-dry and water-saturated samples of a sandstone and a mudstone from the Upper Silesian Coal Basin, Poland, were tested under uniaxial compression conditions with the aim of revealing the effect of moisture on the deformability of these sedimentary coal measure rocks. The volumetric deformation mode in the pre-failure domain was a matter of particular interest. Based on the test results it has been shown i.a. how the presence of water in rock affects the length of the range of linearity of stress-strain characteristics, the linear and secant moduli of axial of stiffness, the linear and secant Poisson's ratios, the threshold of absolute dilatancy, the axial strain at failure and the dilatant volumetric strain at failure.

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