Estimation of Excavator-Automobile Complex Productivity at Changing of Engineering and Geological Conditions

In open pit mining of solid minerals, loading of rock mass from the face is usually carried out without moving the excavator until the dump truck is fully loaded. To ensure that the dump truck body is filled at maximum excavator productivity, the volume of rock mass in a single removed face block should correspond to the capacity of the body, taking into account the loosening of rock during excavation. The article considers the influence of such factors as the minimum radius of excavator digging at the level of its placement, the step of excavator movement, the coefficient of rock loosening during its removal from the massif when working in the mining face, on the volume of downhole block and the angles of excavator rotation for unloading, taking into account the safe operation of excavation-loading and transportation equipment. As an example, the excavator Komatsu PC1250 backhoe is considered when paired with a dump truck BELAZ 7531 (240 tons) when loading coal by top and bottom digging, with the dump truck below the level of the excavator from the side of the slope across the strike of the seam.