The influence of parameters of drilling and blasting operations on the performance of hydraulic backhoes at coal open pits in Kuzbass

The article describes a problem of increasing hydraulic backhoes performance on the open coal pits depending on the parameters of drilling and blasting operations. When developing coal-bearing zones of complex-structured coal deposits, due to the design features of working equipment, mobility and autonomy, hydraulic backhoe excavators are able to perform both mining and overburden operations more efficiently than rope shovels. Hydraulic backhoe excavators are extracting machines with downward scooping, which determines the working out of shotpile of the blasted rock in several layers. Therefore, the primary technological directions of increasing the efficiency of backhoes’ operations are the justification of parameters of drilling and blasting operations to ensure a rational degree of rock crushing and rational parameters of the face for maximum realisation of the design features of excavators. As a result of research, the specific consumption of explosive and the diameter of explosive boreholes are among the most significant controlled technological factors that affect the quality of rock crushing. The substantiation and practical application of rational technological parameters for hydraulic backhoes at the open coal pits can provide higher technical and economic indicators on the backhoes application, compared to the rope shovels. The research was based on the data from Kuzbass (Kemerovo region, Russia) coal deposits being developed by open pits.