金川三矿区下向进路胶结充填采矿法采场结构参数优化

Optimization on Stope Structure Parameters of Downward Drift Cemented Filling Mining Method in the Third Mining Area of Jinchuan

为了解决金川集团三矿区下向进路胶结充填采矿法单炮爆破量少、采矿成本相对较高等问题,在金川集团三矿区开展了包括5m×4.5m、5.5m×4.5m以及6.0m×4.5m在内的3种不同断面尺寸的采场进路现场试验。得到了采场进路顶板竖直方向最大压应力、顶板最大下沉量以及两帮最大收敛变形量。然后采用层次分析法(AHP)和逼近理想解排序法(TOPSIS)的综合评价模型,建立了考虑安全、经济、技术、外部条件、环境条件等五方面因素的综合评价体系,优选出了5.0m×4.5m的最佳断面尺寸。试采结果表明:优选后的5.0m×4.5m断面尺寸比原5.0m×4.0m断面尺寸采场单炮矿量提高12.5%、采矿成本降低4.9%。同时也说明了AHP-TPOSIS方法在下向进路充填采矿法采场结构参数优化中的有效性。

In order to solve the problems of low single-shot blasting amount and relatively high mining cost of downward drift cemented filling mining method in the third mining area of Jinchuan,field tests of stope drifts with three different section sizes including 5m×4.5m,5.5m×4.5mand 6.0m×4.5mwere carried out in the third mining area of Jinchuan.The maximum vertical compressive stress,the maximum subsidence of the roof and the maximum convergence deformation of the two sides were obtained.Then,using the comprehensive evaluation model of analytic hierarchy process(AHP)and technique for order preference by similarity to an ideal solution(TOPSIS),a comprehensive evaluation system considering five factors including safety,economy,technology,external conditions and environmental conditions was established,and the optimal section size of 5.0m×4.5mwas selected.The test results show that the optimized section size of 5.0m×4.5mis 12.5%higher than the original section size of 5.0m×4.0m,and the mining cost is reduced by 4.9%.At the same time,it is proved that the effectiveness of AHP-TPOSIS method in optimization on stope structure parameters of downward drift cemented filling mining method.