RESONANCE IN ROCK MASS AS THE KEY REASON OF GEODYNAMIC PHENOMENA

Abstract

It has been demonstrated that rock are classic auxetics in which elastic factors change their values and signs. It has been determined that the characteristic deformations, in terms of which elastic characteristics change their values, are quantized and constant for each material. Four characteristic stages, inherent to all rocks despite their stress state type and comprehensive pressure value, have been singled out during deformation. It has been defined that jump of amplitude of linear and shear deformations, resulting from double vortex and wave resonance in terms of velocity, dimensions of structures and frequency (stage 3), is a failure predecessor. Increase in minimum relative deformations (i.e. oscillations of a working face of a seam) and in maximum relative deformations (i.e. oscillations of roof or walls of a mine working) up to several percent have been proposed as the failure criterion.