The methodology of rock strength passport’s construction
The article reviews a method of rock strength passport’s construction according to GOST 211153.8-88. Such a passport is the envelope of the Mohr limit stress circles in the coordinates of normal and shear stresses obtained in the known way. The research regulates the use of experimental data under uniaxial tension and compression, as well as under volumetric stress state. It recommends using an empirical strength criterion, the parameters of which are determined only in tension and compression tests. This work proposes an empirical construction of the envelope apart in the area from uniaxial tension to uniaxial compression, and then from uniaxial compression and under different states of triaxial compression.