Abstract
The paper presents analytical formulae of the transportation en- ergy of blasted rock mass depending on the route slopes. The figures are obtained for mining dump trucks with a carrying capacity of up to 55 tons, from 55 to 130 tons and from 130 to 320 tons. In addition, analytical for- mulae are presented for the total destructive energy of the structural section elements of dump trucks depending on the longitudinal slope of the route. The work uses the parameters of crack-like defects that are formed on the rear axle housing component of BelAZ heavy dump trucks. The energy de- pendences of the transportation and destruction processes for mining trucks of various carrying capacities are given. An energy joint diagram has also been constructed, which allows determining the maximum allowable val- ues of the transportation energy of the rock mass and the destruction of the structural section elements for given route slopes.
Highlights
Rock mass transportation by heavy trucks according to the criterion of energy intensity can be divided into energy-consuming and energy-saving modes.Energy-saving mode includes such stages as loading and unloading, waiting for loading, shift change, lunch break
The value of the specific energy consumption was adopted as a criterion for assessing the energy efficiency of transport systems in deep pits; it was determined by the formula gg PP = ii kk kk kk, (1)
Where Рf is the specific energy consumption for transporting 1 ton of rock mass per 1 m, g. f / t·m; gg - specific diesel fuel consumption of a mining truck, g/t·m; i – is the route slope, ‰; kproc - processing coefficient, taking into account the energy costs of obtaining diesel fuel from oil; kd – coefficient taking into account energy costs for the extraction and transportation of fuel; ksh – coefficient taking into account the difference in specific heat of combustion of diesel and standard fuel
Summary
Rock mass transportation by heavy trucks according to the criterion of energy intensity can be divided into energy-consuming and energy-saving modes. Energy-saving mode includes such stages as loading and unloading, waiting for loading, shift change, lunch break At these stages, the dump truck does not move, the engine idles, and there is no significant energy consumption. The main influence on the energy change during exploded rock mass transportation and the destruction of structural sections of mining dump trucks is in energy-consumption operating modes. These include the movement of the truck along straight technological roads, uphill and downhill, turnings and railway crossings. The largest energy amount of a loaded dump truck is spent on the uphill and downhill, when transporting rock mass In these areas, mining technological and technical factors have an interconnected effect, which affects both durability and energy intensity [4-8]. Methods and means of probabilistic statistics were used in order to establish the relationship of energy-intensive processes of rock mass transportation and the destruction of structural sections elements of mining trucks to reduce mining equipment downtime, as well as labour and financial costs
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