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The strength chart of rocks is an important characteristic in the development of minerals, the design of various geo-engineering structures. In its construction, the strength data of laboratory mechanical experiments are used, which include indirect or direct tensile, uniaxial compression, and triaxial compression according to the Karman's scheme. The necessary minimum information is the data from the first two types of test. Mohr-Coulomb circles are constructed for each specimen in the coordinate system "shear st...