INFLUENCE OF THE HYDRAULIC EXCAVATOR LOCATION WITH A BACKHOE IN THE FACE ON THE EFFICIENCY OF ROCK MASS EXCAVATION

Purpose. The well-known technological schemes for the development of overburden and production benches in open pit mines for the extraction of soft rocks are analyzed. It is noted that each scheme is characterized by certain parameters of mining operations, which are set taking into account specific mining and geological conditions, the requirements for optimality of mining and transport equipment, and safety. Methodology. To solve the problem, a comprehensive research method was used, which consists in the analysis of previous work on the research of the influence of the location of excavation and loading equipment in the face on the efficiency of its operation and analytical substantiation of the influence of the spatial arrangement of the excavator on its performance. Results. It is recommended to use hydraulic excavators of the «backhoe» type for open pit mining of soft rock deposits according to one of the three existing technological schemes, depending on the mining and geological conditions of mining. The influence of the excavation and loading equipment location relative to the face on its productivity and the completeness of the rock mass is shown. Originality. The interrelation of technological parameters of hydraulic excavators of the «backhoe» type with the prism of a shortage of minerals, which remains in the bottom of the ledge excavation, has been established. The graphical dependence of the technical performance of the excavator on the angle of its rotation for unloading is obtained. Practical value. It was found that with an increase in the angle of rotation of a hydraulic excavator with a backhoe for unloading from 30 о to 180 о , its productivity decreases by 2.0 times regardless of the dump truck location – below the standing level or at the standing level. In general, the productivity of the excavating and loading equipment when unloading it into a dump truck, which is located below the level of the excavator, is 9.7 % more than when the dump truck is located at the level of the excavator. References 12, tables 1, figures 3.