Abstract
The constant increase in traffic load at mining enterprises forces to look for ways to improve the quality of feeder roads of coal open pits. There is a constant search for tools and methods for improving road pave- ment to increase the service life of truck haul roads. It is known that haul roads are topped mostly with lightweight flexible pavements due to the pe- culiarities of moving vehicles. One of the most applicable materials for pav- ing truck haul roads is crushed stone sand mixtures. However, the lack of scientific research aimed at finding ways to improve the riding quality of open pit haul roads and increase the efficiency of open-pit truck haulage op- eration due to the roads as component of a system did not allow the use of dense-graded mixtures as a pavement for open pit haul roads. In this work, studies were carried out to optimize the grain-size distribution of crushed stone sand mixtures taking into account the physical and mechanical, strength, and deformation properties of the material.
Highlights
A high share in the structure of the cost of rock mass haulage in open pit mining, reaching 15-35% depending on the capacity of dump trucks [1], accounts for repair and purchase of tires
In spring and autumn, when the physical and mechanical properties of base and pavement rocks are the most unfavorable and it is not possible to impose restrictions on the dump truck traffic, the performance of vehicles decreases by 15-20% due to a significant deterioration in the condition of open pit haul road pavements; traffic often stops [5]
Based on the obtained dependences, it is possible to optimize the grain-size distribution of crushed stone sand mixtures taking into account physical, strength and deformation characteristics: 1. In order for the layer made from the crushed stone sand mixture to have a high dry bulk density, the content of grains of a certain size should not exceed a certain value A
Summary
A high share in the structure of the cost of rock mass haulage in open pit mining, reaching 15-35% depending on the capacity of dump trucks [1], accounts for repair and purchase of tires. In spring and autumn, when the physical and mechanical properties of base and pavement rocks are the most unfavorable and it is not possible to impose restrictions on the dump truck traffic, the performance of vehicles decreases by 15-20% due to a significant deterioration in the condition of open pit haul road pavements; traffic often stops [5]. This is due to the fact that existing pavement types topped, as a rule, with overburden rocks or single-fraction gravel are quickly destroyed and difficult to repair, and, do not provide the required riding qualities. - use of dense crushed stone sand mixtures allows reducing rolling resistance by 1525%, which generally leads to a decrease in fuel consumption and, cost of transportation
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