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Most of the solutions to the problems of rock mechanics, rock mass mechanics, but also soil mechanics and geotechnics ignore the influence of the time factor. The solutions are here and now, at the moment. Meanwhile, plastic-viscosity properties, when rocks are in a 3D stress state, play more and more importance in the course of time. The deformability variability is of particular importance, as measured by the modulus of elasticity E. This chapter analyzes the magnitude of this modulus obtained in uniaxial short-term tests and creep tests of a well-known and described, typical sandstone, at different stress values 0=const

SELECTED PROBLEMS OF RHEOLOGY IN THE CONTEXT OF ROCKS BEHAVIOUR. VARIABILITY OF THE MODULUS OF ELASTICITY AS AN EXAMPLE OF THE INFLUENCE OF TIME AND STRESS FACTORS