Abstract
The objective of this paper is to reveal the mechanism of creating conditions for the continuous explosion of coal dust by transferring seismic energy to coal dust located along the perimeter of a working. The ANSYS software package was used to model the movement of coal dust particles in the air under the influence of seismic waves caused by the action of an explosion. It was confirmed by modelling that seismic waves, provoked by an explosion, propagate in the rock mass at a higher velocity than the moving explosive front in the air of a working. The qualitative and quantitative behaviour of a layer of coal dust in the process of oscillation of the working walls under the influence of seismic waves during one second was described. The stage of dynamic loosening of the powder is supplemented by the initial period of the mechanism of explosion development, when there are no combustible concentrations of gas or coal traces in the air composition of the mine working before the incident. It is established that under the seismic influence at a distance of about 50 m from the hypocentre of the explosion, a layer of powder-like dispersed coal rises into the air forming a dust cloud, which is the initiator of further continuous development of the explosion spreading in a network of mine workings.
Highlights
Explosions of air-methane mixtures, as well as air-coal dust mixtures, in the mine workings are the most severe types of accidents in terms of number of victims and financial loss
The objective of this paper is to reveal the mechanism of creating conditions for the continuous explosion of coal dust by transferring seismic energy to coal dust located along the perimeter of a working
The stage of dynamic loosening of the powder is supplemented by the initial period of the mechanism of explosion development, when there are no combustible concentrations of gas or coal traces in the air composition of the mine working before the incident
Summary
Explosions of air-methane mixtures, as well as air-coal dust mixtures, in the mine workings are the most severe types of accidents in terms of number of victims and financial loss. From 1990 to 2013 (before the start of hostilities in Donbas), the largest number of injuries in the coal mines of Ukraine (65% of total injuries and 58% of fatalities) was caused by gas and dust explosions (Kostenko et al, 2021). The situations where the blast wave travelled in a network of workings over long distances, sometimes for several kilometres, with no flammable gases or dust in the air, are characterized by severe consequences. Unlike the mixtures of flammable gases or vapours with air, which are usually quasi-stable and tend to occupy the entire available space, the air-dust suspension is an unstable, inhomogeneous system, where solid par- The characterization of the peculiarities of the mechanism of explosive front development in the workings, where no conditions for the combustion of aerosols exist, is of urgent scientific and technical importance.
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