Abstract
The article discusses two deposits of coal mining by the open method. The «Zarechnyi» open-pit is located in Kuzbass, and the «Vostochno-Beiskyi» open-pit is in Khakassia. The main parameters of drilling and blasting operations are given, the geological structure of the deposits is described. The methods of calculating the specific charge, the diameter of the wells and the grid of wells are considered. Blasting operations are an integral part of the mining process. The cost of finished products and the quality of raw materials supplied to the crushing and screening complexes depend on the results of blasting of the rock mass. The currently used retractable blasting technologies, produced according to standard designs, lead to large energy losses during the explosion, as well as to the output of the oversized fraction, which in turn leads to downtime, reduced productivity and breakdown of transport and loading equipment. The paper substantiates the parameters of drilling and blasting operations taking into account the physical processes occurring in the explosive cavity and during the stress wave propagation in the rock mass. Parameters of detonation products are estimated on the basis of shock-wave compression, the refraction of a detonation wave into a rock based on the theory of the breakdown of an arbitrary discontinuity, the stress wave propagation taking into account polymorphic transformations and dissipation energy. Recommendations for reducing the specific charge of explosives, for choosing the diameter of the borehole charge and the grid of wells are proposed.
Highlights
The paper presents the analysis of drilling and blasting parameters for coal open-pits of Kuzbass and Khakassia on the example of the open-pits «Zarechnyi» and «VostochnoBeiskyi»
The «Zarechnyi» open-pit is located in Kuzbass, and the «Vostochno-Beiskyi» open-pit is in Khakassia
The paper substantiates the parameters of drilling and blasting operations taking into account the physical processes occurring in the explosive cavity and during the stress wave propagation in the rock mass
Summary
The paper presents the analysis of drilling and blasting parameters for coal open-pits of Kuzbass and Khakassia on the example of the open-pits «Zarechnyi» and «VostochnoBeiskyi». The size of the maximum permissible pieces of blown up rock in the collapse is limited by the parameters of the movable objects of the excavation and loading, transport and crushing equipment. According to the work [5] the maximum permissible sizes of pieces of blasted rock mass taking into account the different volume of shovels are given in table 1. Most of the formulas used in the calculation of the drilling and blasting operation parameters do not take into account the detonation characteristics of the explosive, such as the detonation velocity, the pressure of the detonation products, the mass velocity of the detonation products particles, do not estimate the crusher zone during the stress wave propagation, and the physical processes occurring during loading of rock
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