Gravity flow of rock in caving mines: Numerical modelling of isolated, interactive and non-ideal draw
添加于 2016/12/5 23:01:56 178次阅读 | 0次推荐 | 5个评论
A fundamental understanding of the flow of rock within block caves can assist in developing strategies for the optimization of recovery from caving mines. Predictive tools for caving flows are often based upon scale approximated physical models or small scale numerical studies. The simplified nature of these models often leads to results which resemble the well known theories developed for the flow of grains within silos. Marker trial data from caving operations suggest that the flow of rock within caves is significantly more turbulent in nature often leading to regimes not well characterised. Two reasons for this difference were hypothesised; the first being that models were not able to adequately capture the high stresses within block cave operations and the second being that models were not doing justice to the size and shape distribution of particles as observed at drawpoints. This thesis explores both these areas by the construction of two high resolution models for flow developed using the Discrete Element Method(DEM). A full scale, far field model accurately captures the correct stress regime and allows examination of variables including porosity, velocity, shear banding and stress whilst a highly detailed, block aggregate model was used to investigate the effects of particle shape, size distribution and secondary fragmentation on flow.