无底柱分段崩落法进路宽度的优化确定

进路宽度是反映无底柱分段崩落法技术经济效益的重要技术指标,为确定无底柱分段崩落法最优进路宽度,以新疆某铁矿为工程背景,基于随机介质放矿理论、wilson弹塑性理论、FLAC3D数值模型,通过矿柱稳定性分析提出了进路极限宽度公式,并得到该矿的进路极限宽度为7m。结合技术经济分析,采用最高积分法对7种进路宽度进行优化。优化结果表明,最优进路宽度为6.6m,除了可获得良好的放矿效果外,还可使每一进路增加60万元收益。该进路宽度综合考虑了安全、技术、经济等因素,既保证了采场的安全性、掘支技术的可行性,又降低了矿石的贫损指标,提高了回采的经济效益,研究成果对矿山生产具有实际指导意义。

Optimization of production drift width in the sub-level caving method

The width of production drifts has a definitely significant effect on the economic benefits of mines adopting sub-level caving mining operations. In this study, an optimization method has been presented to determine the width of production drifts in sub-level mining, based on the stability analysis of pillar between sub-level drifts using the stochastic medium theory for ore draw, Wilson theory and FLAC3D routine. The case study of an iron mine in Xinjiang, China, shows that the theoretically optimal width for the drifts is 7 m, and this figure is optimized to 6.6 m after a detailed technological and economical investigation of seven various drift widths has been made by using the highest integral method. The optimization results indicate that the effect of ore drawing is good, and the profit for a single drift is increased by 0.6 million Yuan accordingly. This methodology present involves an integrated consideration of safety, practices for driving and supporting drifts and economic benefits in sub-level caving mining, and can be of significance to guide production operations for similar mines.