Abstract
Overburden and mining operations at open-pit mines are performed mainly by powerful shovel-truck systems (STSs). One of the main problems of the STSs is a rather low level of their operating quality, mainly due to unjustified over-trucking. In this article, a functional criterion for assessing the qualify of the STS operation at open-pit mines is formulated, derived and analyzed. We introduce the rationale and general principles for the functional criterion formation, its general form, as well as variations for various STS structures: a mixed truck fleet and a homogeneous shovel fleet, a mixed shove! fleet and a homogeneous truck fleet, mixed truck and shovel fleets. The possibility of assessing the quality of the STS operation is of great importance for identifying the main directions for improving their operational performance and operating quality, optimizing the main performance indicators by the qualify criterion, and. as a result, for possible saving of material and technical resources for open-pit mining. Improvement of the quality of the STS operation also allows increasing the mining safety and decreasing the atmosphere pollution - by means of possible reducing of the number of the operating trucks.
Highlights
Since the quality of the shovel-truck system operation can only be manifested in the course of fulfilling its function in accordance with its purpose under certain conditions, the work of the STS as an unified system within the mine should be viewed as the result of interaction of its elements under restrictions imposed by the external mining environment
We introduce the rationale and general principles for the functional criterion formation, its general form, as well as variations for various STS structures: a mixed truck fleet and a homogeneous shovel fleet, a mixed shovel fleet and a homogeneous truck fleet, mixed truck and shovel fleets
It is necessary to have a functional criterion for joint work of shovels and trucks in the STS structure, taking into account constraints imposed by the external environment – including in terms of its protection and mining safety
Summary
Since the quality of the shovel-truck system operation can only be manifested in the course of fulfilling its function in accordance with its purpose (timely excavation, loading and removal of rock) under certain conditions, the work of the STS as an unified system within the mine should be viewed as the result of interaction of its elements (mining shovels and trucks) under restrictions imposed by the external mining environment. It is possible to balance the total production of Ns available shovels with the help of the necessary number of trucks Nt by comparing the actual production of shovels, which are leading machines in the STS, with the potential production of the truck fleet.
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