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Journal of Mining Sciences

2014 year, number 2

Experimental Analysis of Thermally Stimulated Acoustic Emission in Various-Genotype Rock Specimens under Uniaxial Compression

V. L. SHKURATNIK, E. A. NOVIKOV, R. O. OSHKIN
National University of Science and Technology (MISiS), Leninskii pr. 4, Moscow, 119049 Russia
ftkp@mail.ru
Keywords: rocks, genotype, uniaxial compression, thermally stimulated acoustic emission, theoretical basis, stress-strain state, porosity

Abstract

The consistent patterns of low temperature-stimulated acoustic emission (TAE) in rocks of various genotypes and porosity, under uniaxial mechanical compression are experimentally examined and theoretically based. It is shown that these consistent patterns obtained in magmatic, metamorphic and sedimentary rocks qualitatively coincide. The authors compare limits of deformation stages in the tested rocks, found by a conventional method based on strain measurements in specimens under mechanical compression and by the TAE method. It is explained that the thermal acoustic emission phenomena are associated with the transfer of the studied objects between deformation stages depending on the initial faulted-porous structure of a geomaterial. The applicability of the TAE method to controlling stresses and their time and space dynamics in rocks is illustrated.