Abstract
Previous simulation studies of dust particles movement behavior in open-pit coal mines only aimed at a single operation link, and the macro simulation is lacking. This study seeks to explore microscopic migration and macroscopic diffusion of dust particles in the mining area by numerical simulation method. The movement characteristics revealed, and the distribution law of the dust particles in a stable state with the corresponding migration paths in the mining area were obtained respectively. The results showed that the increase amplitude of dust particles diffusion velocity was inversely proportional to particle size, which was vital for dust pollution in the mine. And the larger the particle size in the mining pit was, the lower the escape rate of the dust particles was. Dust particles distributed over a wide range that were not limited by space height, and the distribution characteristics of dust particles at different heights were basically the same. Meanwhile, it is found that the dust distribution in the two places is relatively concentrated due to the circulation phenomenon of the mining pit and the west dump. And wind action would accelerate the moving dust particles to reach a stable distribution state.
Highlights
Previous simulation studies of dust particles movement behavior in open-pit coal mines only aimed at a single operation link, and the macro simulation is lacking
It was found that dust particles with particle size of 2.5 μm had the maximum movement velocity, and dust particles with particle size of 100 μm had the minimum movement velocity
The movement velocity is inversely proportional to the dust particle size, which is close to the stable velocity of 4.5 m/s
Summary
Previous simulation studies of dust particles movement behavior in open-pit coal mines only aimed at a single operation link, and the macro simulation is lacking. In terms of the evaluation of particles motor behavior with environmental effect, many foreign scholars have been carrying out large-scale researches, such as the saltation, creep and suspension movement of sand particles, which laid a foundation for the theory study on migration behavior of dust particles in mining areas[5,6].In terms of the application of numerical simulation models, most researchers at home and abroad applied models to explore the diffusion and migration process of urban atmospheric environmental pollutants at p resent[7]. Studies on dust particles in open-pit coal mines are mainly focused on a single operation link[8,9], and little about macroscopic diffusion and distribution of dust particles in the whole mining a rea[10]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
