Figure 2
From: Stress-dependent Mohr–Coulomb shear strength parameters for intact rock
Rock testing facility. (a) Schematic of the triaxial cell. The axial and confining stresses are supplied and maintained by high-pressure oil pumps. (b) Photograph of cylindrical rock specimens (left: limestone specimens; right: sandstone specimens) used in laboratory tests. (c) Schematic of the specimen cell. The grey shaded part is the rock specimen. The specimen in this cell is under the isotropic lateral compression, i.e., \(\sigma_{1} > \sigma_{2} = \sigma_{3}\).
