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The contribution brings description of the mechanical properties of igneous rocks, particularly syenite from Kamenn? quarry within the T?eb?? Massif in Czech Republic. It is mainly focused on impact of triaxial compression testing in order to obtain data about the rock applicable for designing underground structures located at greater depths below the surface. The mechanical properties were determined from series of laboratory tests consisting of following procedures: (1) indirect tensile testing, (2) uniaxial com...

The fundamental element to be ensured during laboratory tests is the control of the boundary conditions in terms of stress, strain and drainage conditions. The determination of the effective stresses is inherently associated with full saturation of soil specimen, as it allows to apply the Terzaghi's principle of effective stress. This paper describes the influence of partial saturation of soil on shear strength and deformation properties obtained from laboratory tests. The use of back pressure method, as the most ...