The Research on Diffusion Characteristics of Heavy Mine Particles in Low-surface Layer

Based on Lagrangian stochastic model, the spread conditions are analyzed with particle groups. The results show that: (1) From the view of local wind turbulence on the particle diffusion characteristics, the concentration distribution of the heavy particles has evident suspending feature along the ventricle direction. The air speed and turbulence intensity have obvious influence on the particle diffusion characteristics. (2)Through analyses on movement trail of particle group, the most of mine particles are heavy big-size ones, they move along the trail of themselves and move downwards the ground after slipping it the air for a short and crash with the particles on the ground. Those particles cause saltation and creepagc phenomena. The percent of the mass migration caused by the saltation movement is above 70% to the total mass migration.So, the heavy particles are only cause local air pollution and the maximum contributor to ground concentration near the particle source.