The deformation dynamics of the experimental adit's material during a coal dust explosion

Abstract

The purpose of this paper is to improve the mechanism that forms an explosive environment within the workings' space from the accumulated coal dust, based on determining the dynamic deformations under the influence of an explosion in the material that contains the examined working. To simulate the dynamic changes in the stressed-deformed state of the rock mass with an experimental adit inside when under the impact of explosive loads, a modern method of finite differences of mathematical-computer modeling has been used. During the research, the mathematical model has been adapted for studying the stressed-strained state of the rock mass that hosts the created experimental adit at the imitation of a dust blast. Additionally, the model takes into consideration the peculiarities of the direct impact of explosion products on the working's wall, as well as their indirect action. The data were acquired on the propagation of the progressive front of seismic waves inside mining rocks that host the experimental working. The parameters of speed and acceleration of the seismic wave components have been established that occur ahead of the shock front, which moves in the gas environment of a mining working during the explosion of a dust-air mixture.

This paper reports data on the dynamic processes occurring in a mining massif and on the surface of the experimental working at the chain explosion of a dust-air mixture. The simulation results have made it possible to confirm the hypothesis about the loosening of dust accumulations under the influence of seismic waves, which emerge significantly ahead of the explosion front moving along the working. The modeling results provide an opportunity to improve the systems of protection or localization of the dust-air or dust-gas-air explosions. The existence of seismic waves ahead of the shock front makes it possible to prepare in advance the means for localizing dust explosions