Improving the efficiency of using dump trucks under conditions of career at open mining works

Purpose. Increasing the efficiency of road transport by changing the structure of slopes of transport inclines in opencast mining of mineral deposits. methodology. The paper uses a theoretical analysis based on the theory of the use of the acting inertia forces of a moving dump truck to overcome the elevated slopes of the traffic route. The analysis and generalization of the analytical method for solving the kinematics equations of uniformly variable (equally accelerated or equally slow) motion of dump trucks was used to confirm the theoretical results and accepted assumptions. Findings. The paper attempts to generalize, develop and offer more complete solutions to the problems of rational use of dump trucks by using the inertia forces of a moving dump truck to overcome the elevated slopes of the career roads. There is given an analytical solution of traction and braking problems when trucks overcome the slopes of transport inclines in open field mining. It is shown that these solutions are the simplest for practical use when designing new career routes, while exploiting transport inclines of deep quarries. Originality. Mathematical models of dynamic processes occurring during the implementation of the tangential traction force of a motorized dump truck developed on elevated slopes of career paths are developed. They differ from those known by the fact that inertia forces resulting from acceleration during the motion of a dump truck are used to overcome elevated gradients in the transport inclines of quarries. As a result of numerical simulation, the regularities of changes in the speed of movement of dump trucks with alternating horizontal and inclined road sections depending on their length and slope angles were established. This allows improving the process according to the criterion of surmounted elevated slopes of open pit transport inclines, cutting their length almost by half, reducing the time of movement of dump trucks and improving performance during transportation of rock mass. Practical value. The results obtained in the work, presented in the form of calculation formulas, make it possible to reasonably calculate the routes of transport inclines for the open mining of mineral deposits at the quarry design stage. This ensures reduction of the size of the quarries cutback in the development of deep quarries.