Justification of the Optimal Granulometric Composition of Crushed Rocks for Open-Pit Mine Road Surfacing

Viktor Shalamanov,Dmitry Boiko,Serguey Shabaev,Vladimir Pershin,M Tyulenev,Y Tan,M Cehlar,S Zhironkin,A Khoreshok,S Voth

doi:10.1051/e3sconf/20171501006

Viktor Shalamanov, Dmitry Boiko + Show 8 more

Open Access

https://doi.org/10.1051/e3sconf/20171501006

Copy DOI

Abstract

The specific weight of the open coal mining method in Kuzbass is constantly growing due to higher hazard and low profitability of the under-ground mining method. It is possible to reduce the cost of open-pit coal mining using overburden rock in constructing temporary pit roads. The purpose of the work is to justify the possibility of using overburden rock for the construction of temporary technological roads. To this end, we set the tasks to determine the rational granulometric composition of crushed rock, dependences of its unit weight, static elastic modulus, and ultimate shear resistance. This study justifies the most efficient granulometric composition of crushed rock based on theoretical studies of the optimal structure of granular materials, taking into account the probability theory of particle-particle packing, laboratory studies of the dependence of the unit weight and the static elastic modulus on the content of par-ticles of different sizes, and also the calculation of ultimate shear resistance of crushed rocks. As a result of the conducted studies, it has been established that the optimal granulometric composition of crushed rock, which at the same time ensures high values of unit weight, static elastic modulus and ultimate shear re-sistance, is achieved when the content of particles larger than half of the maximum is 40 to 55% and increases integrally with decreasing of the average particle diameter.

Highlights

Road surface is one of the most important elements of the pit road dressing, the average speed of pit transport and, its efficiency largely depend on the condition of roads
The analysis of previous studies [1-11] shows that the crushed rock of the optimal granulometric composition should consist of various size particles taken in a certain quantitative ratio, which provides increased internal friction and adhesion between the particles, high unit weight and an insignificant intensity of the grain grinding process [12 - 15]
Kandaurov, were laid in the basis of the theoretical model of optimal packing of different-sized particles, the following assumptions and conjectures were introduced in it: The entire crushed rock consists of N-components, and a certain fraction characterized by an average diameter is taken as a component

Summary

Introduction

Road surface is one of the most important elements of the pit road dressing, the average speed of pit transport and, its efficiency largely depend on the condition of roads. The analysis of previous studies [1-11] shows that the crushed rock of the optimal granulometric composition should consist of various size particles taken in a certain quantitative ratio, which provides increased internal friction and adhesion between the particles, high unit weight and an insignificant intensity of the grain grinding process [12 - 15]. These conditions can be achieved with the largest possible number of coarse particles and minimal content of fine and silty particles necessary to create high unit weight and to ensure the cohesion of large particles

Objectives

Methods

Results