Abstract
On the basis of physical ore-drawing test research, the irregular particle clusters are constructed by adopting particle element theory and PFC numerical simulation software. Meanwhile, the ore dilution mechanism in the process of stoping caving ore and rock bulk is investigated, especially, the permeability characteristics of small size particles. Main factors considered in the numerical test are particle density ratio, particle diameter ratio, vertical stress of overburden, and shape of large particle size. Results show that the irregular particle morphology could more accurately reflect the permeation characteristics of small size particle in caved ore rocks. The particle diameter ratio and large size particle morphology are significant factors that affect permeability characteristics of caved ore and rock. The infiltration rate and diameter ratio of small particles meet negative exponential function. Meanwhile, the closer the particle size is, the more difficult the infiltration is. In the actual ore-drawing process, the evenness of caving ore-rock bulk should be improved as much as possible, particularly near the ore-rock contact zone.
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