Abstract
This contribution brings overview of mechanical properties of greywacke with focus on fracture mechanics parameters. Investigated rock type is clastic sediment, relatively widespread in Moravia region. The rock type is significantly utilized in construction industry. For purposes of this study, Kobeřice quarry was selected as sampling locality. Mechanical properties were investigated by deformation controlled 3-point bending test. Chevron notch was created on specimens in order to study fracture mechanics parameters. Moreover, deformation controlled uniaxial compression tests were carried out, as well. Specimens were equipped with strain gauges; thus, elastic modulus and the Poisson’s ratio could be determined. Splitting tensile test was employed in order to determine tensile strength. Mean value of fracture toughness KIC was determined to 1.85 MPa·m0.5. Mean value of uniaxial compressive strength was observed at level of 211 MPa and tensile strength reached 19.4 MPa. Hence, the tested greywacke was considered as high strength rock. Brittle type of failure occurred during the tests. The obtained results were compared with values reported for clastic sediments from several localities in the Czech Republic. Moravian greywacke reached significantly high strength in comparison to other clastic sedimentary rocks and can be considered as valuable raw material for purposes of construction industry.
Highlights
This contribution deals with rock properties evaluation, mechanical properties
Uniaxial compressive strength and tensile strength, which is usually determined by indirect method of splitting tensile test
Afterwards, fracture toughness KIC was determined according International Society for Rock Mechanics (ISRM) methods [3] from the maximal force reached during each test
Summary
This contribution deals with rock properties evaluation, mechanical properties. Strength is one of the most common of the examined parameters of rock. Uniaxial compressive strength and tensile strength, which is usually determined by indirect method of splitting tensile test. The deformability parameters as elastic modulus and the Poisson’s ratio are commonly investigated as well. They are less often investigated but they are not less interesting. Fracture parameters can be utilized in various practical applications, in geotechnical issues e.g. assessment of rock slope stability in case of toppling failure [1] or rock cutting [2]
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