Assessment of the Strength of Rocks in Open Mining Processes in Mining Enterprises

Abstract

The article presents the results of experimental studies on the strength characteristics of the rocks used, the results of studies on the assessment of the stability of the slopes of the open pit mine. Formulas describing the relationship between ultimate and residual strength and residual shear strength of rock samples along the relief surface are determined. Based on the test data, a new method for calculating the residual interface strength of rocks was developed, which was tested on small-sized monolithic samples at opposite technological depths. The strength assessment method is the recommended characteristics of the rock mass near the broken slope (structure attenuation coefficients and internal friction angles). The method relies on test data obtained by breaking small-sized monolithic specimens with a technological recess, taking into account contact conditions along the weakening surface, and can be used in field conditions. In opencast mines, slope instability has a negative impact on the overall profitability of the mine and can also affect safety and the environment. The geometry of the slope has a decisive influence on the slope of the open pit, the quality of the rock mass and the presence of geological features and their characteristics should be studied. The purpose of this study is to show how to choose the optimal general slope angle of mines and according to three design parameters, namely safety (for example, the probability of instability), performance (for example, profit) and mining costs (for example, overburden removal).