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ISSN 0536-1028 (Print)              ISSN 2686-9853 (Online)  

Tagil'tsev S. N. – The Ural State Mining University, Ekaterinburg, the Russian Federation. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

During laboratory hard rock samples testing nonlinear connection of shearing stress and normal stresses is frequently
observed. These facts directly indicate the presence of a higher bound of Coulomb’s law applicability. Theoretical analysis
of geometry indices of Coulomb’s law higher bound state with the use of dimensionless characteristics of stresses allows
detecting the reasons for testing on shear with constriction results deviations from linear dependence. Almost for all
the types of hard rock, actual testing points fulfilled with 45° shear angle, correspond to the certificate of rock strength
beyond the higher bound of Coulomb’s law applicability. Thus, the technique of realization and interpretation of rock
testing on shear with constriction requires significant modernization.

Key words: Coulomb’s law; limiting stress state deformational criterion; higher bound of Coulomb’s law applicability;
dimensionless characteristics of stresses; rock testing on shear with constriction.

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