关键词: 底部放矿口, 速度分布, 影响高度, 影响机理, 采场放矿

Abstract: The development of modern underground mine has promoted the continuous input and application of larger drilling and ore drawing equipment, which has in turn led to an increasing larger haulage drift and cross section of drawpoint. The practice shows that the flow velocity of bulk ore rock at the stope drawpoint and the dimensions of drawpoint have remarkable influence on the drawing effect. According to the state of bulk ore rock flow at the drawpoint, the velocity distribution of the bulk ore rock drawing by bottom funnel-short pass and scraper mucking is analyzed. The affecting mechanism of the drawpoint on the ore drawing is disclosed, which is of guidance significance to the determination of rational stope structural parameters.

Key words: Bottom drawpoint, Velocity distribution, Influence height, Mechanism of influence, Ore drawing at stope