EVOLUTION OF MICROSEISMIC EMISSION SIGNALS AND TEMPERATURE FIELD DURING COMPRESSION OF PRISMATIC MUDSTONE SAMPLES WITH A HOLE IN THE CENTER
V. I. Vostrikov, O. M. Usoltseva, P. A. Tsoi
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: Laboratory experiment, stress, strain, microseismic emission, temperature field
Abstract
This paper presents the results of testing prismatic samples made of mudstone with a hole in the center under uniaxial compression before destruction using the test-measurement complex designed for synchronous recording of stresses, strains, temperature field and microseismic emission parameters. The changes in these physical parameters have been analyzed at different stages of sample deformation. Evolution of the deformation process - the appearance of micro-damages, their localization in the area of future destruction and the appearance of a main crack - leads to a significant change in the spectral composition of microseismic emission signals, micro-deformation field and the temperature field. A temperature increase in the region of the future main discontinuity and generation of powerful low-frequency harmonics under loads approaching the peak can be a forerunner of discontinuity on the surface and, as a consequence, of geomaterial destruction.
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