A Gravity Flow Model of Fragmented Rocks in Longitudinal Sublevel Caving of Inclined Medium-Thick Ore Bodies

摘要

The draw theory is the foundation for decreasing ore loss and dilution indices while extracting deposits from mines. Therefore, research on draw theory is of great significance to optimally guide the drawcontrol and improve the economy efficiency of mines. The laboratory scaled physical draw experimentsunder inclined wall condition conducted showed that a new way was proposed to investigate the flow zoneof granular materials. The flow zone was simply divided into two parts with respect to the demarcationpoint of the flow axis. Based on the stochastic medium draw theory, theoretical movement formulas werederived to define the gravity flow of fragmented rocks in these two parts. The ore body with 55° dip and10 m width was taken as an example, the particle flow parameters were fitted, and the correspondingtheoretical shape of the draw body was sketched based on the derived equation of draw-body shape. Thecomparison of experimental and theoretical shapes of the draw body confirmed that they coincided witheach other; hence, the reliability of the derived equation of particle motion was validated.