基于MRMR的自然崩落法可崩性综合评价研究

Research on comprehensive evaluation of cavability of block caving based on MRMR

岩体的可崩性是决定自然崩落法成败的关键,旨在建立一套基于三维地质统计学方法的矿岩可崩性评价体系。采用距离幂次反比法将钻孔采取的地质信息三维空间数字化,采用3DMine数值计算平台构建基于MRMR岩体质量评价体系的三维数字化模型,从宏观方面评价岩体可崩性区域分布;结合工程类比及崩落块度预测,形成一套矿岩可崩性综合评价体系;最后,将该评价方法应用于Don Javier矿区自然崩落法可崩性评价研究。研究结果表明,该评价体系能够满足自然崩落法岩体可崩性评价分析的需要;Don Javier矿区1 800-2 400 m的MRMR均值为56.4,矿体Ⅲ级中等可崩,初始拉底面积约为15 000 m2;预测Don Javier矿区的崩落块度在0.06-2.95 m3范围,侧面验证了可崩性评价结果的合理性。

A reliable prediction of rock mass cavability is a critical factor in the successful caving of most orebodies. Aim to build a cavability assessment system of rock mass based on three-dimensional geological statistics method. Distance power inverse ratio method was used to digitize the three-dimensional geological information of drill. With the assistant of 3DMine,the three-dimensional digital model was built based on MRMRrock mass quality evaluation system. And then,the area distribution of cavability was evaluated from the aspects of macroscopic. Combining with engineering analogy and the predicted results of caving fragmentation,a cavability comprehensive evaluation of block caving is finished aiming at Don Javier mine. The results indicate that,the evaluation system was finally built. At last,the evaluation method was applied to Don Javier studies of the natural caving method. The result shows that,this evaluation system can satisfy the needs of rock mass cavability evaluation in block caving. The average value of MRMR is 56.4 from 1 800 m to 2 400 m of Don Javier Mine. And the cavability grade of orebody is defined as III medium. The initial undercutting area of production capacity reaches about 15 000 m2. The predicted caving fragmentation of Don Javier is from 0.06 m3 to 2.95 m3 and the results verify the evaluation of cavability.