The effect of low-amplitude vibrations on the process of rock deformation at a constant load has been studied. Deformation characteristics, parameters of regime of acoustic emission (AE), and waveforms of isolated AE-pulses have been recorded during axial compression test of granite samples. A delay of AE activation after the start of vibration action as well as the aftereffect following the termination of a vibration session have been revealed. The delay becomes shorter as the load increases and the time interval between consecutive vibration sessions decreases. A triggering effect of weak vibrations on the rate of dilatation rock strain has been found. The effects observed have been treated in the light of known results concerning vibroelasticity, acoustoplastic effect, and acoustic emission of overburden solids. The proposed theoretical model for vibration action on loaded geomaterials is discussed from the viewpoint of a kinetic concept of solid strength and nonlinear acoustics.

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