Structural considerations of the strength of Krosno sandstones from Mucharz under high pressures

The paper discusses structural considerations of rock strength under high pressures. Medium grained sandstones from Mucharz were used as test material, in which streaks emphasizing lamination can be observed and a distinct direction of longer grain axes. Rock samples were cut out in three perpendicular directions depending on the structural surfaces. Two types of triaxial tests were carried out: triaxial single failure tests and triaxial multiple failure tests. The analysed rocks show greater strength in the plane parallel to lamination than in the plane perpendicular to that structural surface.