S. N. Shabaev


DOI http://dx.doi.org/10.21440/2307-2091-2018-2-85-94

S. N. Shabaev / News of the Ural State Mining University 2 (2018) 85-94


The relevance of the work is conditioned by the fact that the quality of open-pit mining roads has a significant impact on the efficiency of quarry vehicles. At the same time, the use of overburden and host rocks can reduce capital costs as well as operating costs for the arrangement and the maintenance of communication routes.
The purpose of the work is to determine the factors that have a significant impact on the bearing capacity of crushed rocks.
Research methodology is based on the analysis of previously performed studies by deductive methods. The factors which affect the modulus of elasticity of fractured rocks of sedimentary origin are identified. Those, which play the greatest role in the formation of the bearing capacity, are determined. Laboratory experiments determine the dependence between the volume mass and static modulus of elasticity of crushed rocks ofdifferent particle size distribution. This depends on their humidity.
Results. It is determined that the greatest influence on the bearing capacity is the size and density of the packaging of the crushed rock particles. Its moisture content, as well as the content of dust and clay particles in it are also important. The significant role of the last three factors was proved experimentally. Factors that can be neglected are shape, roughness, strength and compressibility of the particles.
Summary. When using crushed rocks of sedimentary origin for the device of structural layers of road pavement technological roads for the correct prediction of the bearing capacity we must not only take into account the degree (coefficient) of compaction and (or) residual voidness. We should also consider their physical parameters, namely the grain size distribution and humidity, including the optimal one. Otherwise, the results obtained characterize only particular cases of achieving a particular elastic modulus. They will give completely different results in case of changes in any of the factors which have a significant impact.

Keywords: rocks; modulus of elasticity; bearing capacity; factors; roads; open mining.



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