矿岩崩落块度预测的节理面三维模拟技术及其应用

基于传统二维状态下块度预测存在的弊端, 提出以构造面的空间展布规律为基础, 利用Monte Carlo技术模拟节理系统, 采用三维实体切割技术建立块体三维截取模型的矿岩块度预测新模型, 实现了矿岩崩落块度的三维预测, 并开发了相应软件OFP 1.0(Ore Fragments Prediction)。研究成果应用于某特大型斑岩铜矿, 预测结果表明: 该矿山等效尺寸大于1.65 m的块体筛上累积百分比为40%, 大于1.26 m的块体筛上累积百分比为59.85%。根据等效尺寸与块体体积的转换关系, 建议放矿口尺寸设置为5 m×5 m, 此时放矿口堵塞几率较小。研究成果为自然崩落法矿山采矿方法设计和工程中的放矿控制提供了重要依据。

Technique and Application of Three-dimensional Simulation of Joint Plane for Ore Fragmentation Prediction in Block Caving

In view of drawbacks in the traditional two-dimensional model for fragment size prediction in block caving, based on the space distribution of rock structure, it was proposed to construct a new 3D model by cutting the three-dimensional entity after rock joints simulated with Monte Carlo method, thus resulting in the fragment size prediction. Then a software, OFP 1.0 (Ore Fragments Prediction), was developed. The application of such technique in a large porphyry copper mine gave a prediction that the cumulative percentage of original block with equivalent size larger than 1.65 m was 40%, and that with equivalent size lager than 1.26 m was 59.85%. Based on the conversion between equivalent size and block size, it is recommended that the ore pass should be  5 m×5 m  in dimension so as to prevent the occurrence of clogging. Such findings can be of reference and guidance in block caving design for underground mining and practical control of ore drawing in mine.