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ABOUT THE VARIATION OF META-SILTSTONE DEFORMATION-STRENGTH PROPERTIES UNDER THE DIFFERENT SCALES
Abstract
Meta-siltstones are solid sedimentary rocks containing some clay material. Such geomaterial is taken mainly for the production of cement and garden paths. It can also be found in coal mines between coal beds. Processes of technological extraction of such natural material are always connected with the problems of its physical and mechanical behavior, therefore it is important to evaluate the basic deformation-strength properties. Moreover, if we consider the influence of the scale factor, we will get a more complete picture describing the properties for the different-scale elements of the rock under study. In this paper, cylindrical specimens of meta-siltstone of two scales were studied: with a height of 60 mm and 30 mm (scale 1); samples with corresponding dimensions 3 times smaller than those specified scale 2. On the Instron 8802 press, mechanical tests of scale 1 meta-siltstone under conditions of uniaxial compression and splitting tensile were carried out. On the Deben Microtest press, samples of scale 2 under uniaxial compression and splitting tensile were tested. The ratio of the length of the samples to the diameter of the cross section was 2 (uniaxial compression) and 1 (splitting tensile), which corresponds to modern test standards. The deformation modulus, the splitting tensile strength, the uniaxial compression strength, the cohesion coefficient, the angle of internal friction are determined. Empirical relationships between the listed values are constructed depending on the scale of the considered specimens.
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