Publication details
Šmyková pevnosť vybraných anizotropných hornín s klivážou
| Title in English | Shear strength of selected anisotropic rocks with cleavage |
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| Authors | |
| Year of publication | 2015 |
| Type | Conference abstract |
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| Citation | |
| Description | The study was focused on exploration of the shear strength of slate with distinguish planes of weakness, i.e. cleavage. Slaty cleavage represents the ability of rock to split into more or less parallel planes and disturbs the rock massif. The presence of these planes of weakness affects the strength and deformational behaviors of rocks and indicates asymmetric fracture of rocks and unpredictable strength behaviour. Tests were carried out on the laminated slate with predetermined shear plane. This rock originates from „Bělá” quarry from the Moravo-Silesian Culm, Czech Republic. The oriented specimens were taken by manual drilling machine. The drilled specimens of slate were divided into five groups based on the different angle between shear plane and cleavage. Testing of each group was carried out in seven directions with an interval of 15°. The first direction which was called “zero” direction was perpendicular to the cleavage. Specimens confirmed anisotropic strength behaviour. Large variability of measured values of the strength was caused mainly by various dip of cleavage and by the direction of shear but in lesser extent. Two types of mechanisms of shear failure of specimens and creating their shear planes were distinguished (sliding vs. splitting). Significant effect of the shear direction on the strength was demonstrated on the group 5, on the specimens with cleavage upright to the shear plane. |