Research on the rational profile of exit trails of auto transport in deep open mines

Purpose. Technical and economical justification of the parameters of the profile of exit trails without horizontal sections in the operation of road transport in deep open mines. Methodology. To solve the objectives, the following methods were used: analytical, graphic methods, mathematical modeling, comparison of options, and analogies. These research methods are used when studying and justifying of a rational profile of exit trails of auto transport in the open mine, as well as defining the width of the working platforms of the excavator, and doing technical-economical calculations of the proposed solutions. Findings. Based on the performed analysis of parameters determining the distance of transportation of rock mass, it was found that when using the exit trails without horizontal sections, the transportation distance is 300 m, and with horizontal sections 531.3m, which exceeds the former by 1.77 times. The trip time when using the transportation scheme without horizontal sections is 7.44 min, and when using it with horizontal sections, it is 8.42 min. It is proved that the use of exit trails without horizontal sections in the open mine of Poltava Mining and Processing Plant reduces the cost of diesel fuel by 42.57% and capital costs by 40.5%. Originality. A comparison of the actual distance of transportation, and time of dump truck trip by component operations is carried out, and expenses for maintenance of open mine roads when using trails with horizontal sections and without them are calculated. The scheme of exit trails without horizontal sections has been offered for the first time, which allows a reduction in the distance of transportation of rock mass by dump trucks with a reduction of rock volume for carrying out conventions by 57%. Practical value. The developed scheme of the route profile without horizontal sections can be applied to overburdening operations, and the development and deepening of open mines for the extraction of different types of minerals, such as iron ore and hard coal. The expected economic effect from the introduction of trails without horizontal sections is determined by the reduction of diesel fuel costs by 52.9 UAH/t.km, and accordingly 1.68 million UAH for the conduction of conventions.