SUBSTANTIATION OF RESOURCE-SAVING FORMS AND PARAMETERS OF STABLE SLOPES OF THE SIDES OF A DEEP QUARRY

Abstract

The purpose of the study is to develop an effective methodology for selecting and calculating a rational, stable profile of the board of deep quarries based on the analysis of methods. In the article, based on studies conducted to assess the stress-strain state of rocks of the court massif of deep quarries in various geomechanical conditions, the causes of mining-geological, hydrogeological and mining engineering conditions that form a violation of the stability of quarry slopes, namely, the discrepancy between the parameters of quarry slopes to mining and geological conditions or insufficient study of these conditions, improper mining operations, the influence of hydrostatic and hydrodynamic forces on rocks, dynamic loads from the action of the mining and transport complex, massive explosions, as well as additional loads on the slopes or adjacent areas, the use of an incorrect method for calculating slope parameters and, in addition, the conditions causing the occurrence of landslides on the slopes based on the analysis of deformation phenomena, contribute to the manifestation of forces leading to a disturbance of the equilibrium state of the rock mass and it turns out that this is a set of artificial processes. In the process of separating the vertical prism of volumetric fracture, the circular cylindrical hypothesis is adopted as the basis. Based on the data obtained, methods for calculating the stability of the sides of the quarry were analyzed, it was found that the height of the step 15-45 m has the greatest effect on increasing the angle of the working side of the quarry, and the irrationality of planar, planar intermediate contours was revealed.  On the practical and theoretical basis of the conclusion of the study, it was found that a flat convex profile of the side surface of the working area of the quarry, along with ensuring stability and ensuring safe working conditions for people and technological equipment, is the most economical method that allows reducing the volume of stripping operations by 25.3 thousand m3 compared with a flat profile.