Search

The study of the technology of excavation and loading operations at more than 15 open pit mines of Kuzbass with the use of trucks shows the general similarity of the technological process in terms of providing transport operations of haul trucks: loading is often carried out at the level of excavator standing, less often – below the level of excavator standing. The predominant scheme of haulage haul truck approach for loading – dead-end, less often – circular, very seldom – through. When digging trenches and working narrow strips, it is difficult to approach excavators due to insufficient width of the site for turning, the necessity of safety and barrier shafts, etc. In this case, the maneuvering time of the haul trucks and their exchange time for loading depends considerably on the skills of the haul truck driver. Considering that the mining operations at the open-pit mines are gradually going deeper and deeper, there is no reason to assume that the width of the vehicle turning sites will increase in the future. Therefore, the use of autonomous heavy platforms, which do not require turning during their delivery for loading, seems very promising in the so-called cramped working conditions. In this work the question of working time losses at haul trucks exchange at loading in real conditions is briefly considered, dependence of average speed of movement and time of trip on a distance of transportation is resulted. [ABSTRACT FROM AUTHOR]

Automobile transport currently dominates the transportation of overburden and coal at open pit mines. Its share has been steadily growing since the 1970s. This is due to objective reasons, first of all, a rather limited area of application of railway transport: a significant transport distance, a large cargo traffic and a small depth of the quarry. First of all, it concerned the depth of open-cut mines, because when deepening the quarry for one trench it was necessary to extract considerable volumes of overburden to provide accommodation of transport berms because of the big radius of curvature of a railway track, which reached 200 m. Therefore, given the fact that open-pit mining went to a greater depth at almost all enterprises, there was a widespread abandonment of rail transport for intra-pit transportation in favor of automobile transport. For various reasons, a fairly economical and promising mode of transport – conveyor transport – has not become widespread at Kuzbass coal mines. Not least of all, this is due to climatic conditions, as well as the complexity of mining and geological conditions of the Kuznetsk Basin, which are among the most complicated in the world. Suffice it to say that more than 80% of coal seams have a complex or very complex structure. Therefore, the problem of research and description of the key characteristics in open-pit mining is very urgent. [ABSTRACT FROM AUTHOR]

Quarry automobile transport is most important in the transportation of overburden and coal in open-cast mining operations. In this article, based on the existing analysis of the use of classic haul trucks, the change in their output is determined by some influencing factors: the type of loading of the rock mass and the bucket capacity of the excavator used. It is taken into account that when loading an unmanned dump truck, there is no need to maneuver the vehicle, which increases output, especially with a small haulage arm. Some output calculation results are given and areas for further research are identified. [ABSTRACT FROM AUTHOR]