STUDY OF SHORT-PERIOD GEODYNAMICS OF ROCK MASS OF KACHKANARSKY MINING AND PROCESSING STATION

Abstract

The paper presents the methods and results of research of current geodynamic activity of the rock mass of Kachkanarsky mining and processing station. The parameters of cyclic short-period geodynamic movements were determined in the form of
continuous multi-hour monitoring by satellite geodesy complexes. The need for geodynamic monitoring of the open-pit mines of Kachkanarsky MPS is due to the aspects of the tectonic structure of the host rock mass, in particular, the impact of a series of
active tectonic disturbances crossing the open-pit mines and the tailing pit. The deformation processes taking place on the northwest wall of the open-pit mine Glavny, as well as the breach of the tailing pit dam are connected with the geodynamic activity, which is realized in the form of trend and cyclic short-period movements by tectonic disturbances.
The experimental studies of the parameters of cyclic short-period geodynamic movements at the rock mass, which is intercepted by a series of active tectonic disturbances of submeridional direction. The amplitudes of movements and deformations in the horizontal plane in height and in three-dimensional space have been established, and the accuracy of geodetic structures has been analyzed. The prevailing frequencies of short-period cyclic movements have been determined by the Fourier-analysis methods, and the graphs of periodograms, whose peak values correspond to their period have been estimated.
The paper shows the role of cyclic short-period geodynamic movements in the formation of the general stress-deformed state of the area of open-pit mines and tailing pits of EVRAZ Kachkanarsky MPS. At the same time, these geodynamic movements lead to the formation of fatigue effects in structures and materials, the "loosening" of rock masses that compose the adjacent rock mass, the changes in the strength properties of grounds at the base of engineering structures, and the effect of thixotropy.