矿石崩落块度的三维模型与块度预测

以金川有色金属公司贫矿为研究对象 ,在确定矿岩可崩性的基础上 ,根据现场节理裂隙面调查结果 ,建立节理网络计算机系统。运用拓扑学、矢体概念以及计算机模拟等技术对矿石崩落块度进行预测。矿石的崩落块度直接影响采场的底部结构设计、出矿设备的选择、二次破碎、炸药消耗的估算等。经过模拟得出的崩落块度预测结果为 :单向尺寸大于 0 8m ,其体积为总体积的 67 3 4% ;大于 1 2m的块度占总体积的 3 2 61%。为自然崩落法的设计与实施提供理论依据。

THREE-DIMENSIONAL MODEL AND PREDICTION OF ORE FRAGMENT SIZE FOR BLOCK CAVING

The low-grade deposit of Jinchuan Nonferrous Metal Company is taken as a studying object. A simulation model on 3D joint network is established based on the determined cavability of ore and rock and on the field investigation in natural discontinuities in an orebody. The ore fragment size for block caving is predicted by means of topology, vector field conception and computer simulation technology. The ore fragment size has a direct influence on the configuration of stope bottom, the selection of loading and handling equipment, secondary crushing method, the calculation of explosive consumption and so on. The simulation results show that the fragment with one-dimensional size of more than 1.2m accounts for 32.61 per cent of the total fragment volume. These results can be used as theoretical basis for design and practice of block caving.