«Proceedings of Gubkin University»

Investigation of acoustic emission activity of rocks under the influence of fluid dynamic loads, modeling of the genesis of “flower” structures

UDC: 550.34.06.013.3
DOI: 10.33285/2073-9028-2022-3(308)-32-41

Authors:

¹ Bulashevich Institute of Geophysics of the Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russian Federation
² Zavaritsky Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russian Federation

Keywords: acoustic emission, stress-strain state of rocks, acoustic impact, fluid filtration, core destruction, “flower” structures, radial-concentric structures, genesis modeling

Annotation:

As a result of the study of acoustic emission activity in core samples under stress-strain conditions, fluid filtration and the imposition of wave action on the PEC-AE installation in conditions as close as possible to the formation in 2017– 2022, cracking and destruction of rocks took place. All core samples were split to a cone-shaped shape, with a round section at the top. The broken off parts of the core had the structure of the propeller blades i.e. a curved helical shape. The chips formed cracks falling at angles of 60–80°. Using the method of seismoacoustic emission, characteristic noise during the formation of cracks, the fading of sounds before splitting the sample and then a sharp increase from the discontinuity of the rock were recorded. This process is similar to that of the formation of “flower” structures in mountain massifs, the angles of incidence of faults of which coincide with the angles of incidence of chips in the studied core samples. The formation of "flowers" in nature is known to be associated with shear deformations associated with lateral compression. The results of these studies suggest that similar structures can be formed without horizontal displacement, which makes them related to explosive ring structures of shields and platforms.

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