胶结充填体下采场结构参数优化研究

Study on Optimization of Stope Structural Parameters under Cemented Fill

要在大体积胶结充填体下对矿体进行安全高效地开采,合理的采场结构是采矿设计首先需要考虑的问题。在综合分析某地下矿山地质概况、开采技术条件现状的基础上,采用经验法与理论计算法对采场结构参数进行计算,提出了4种采场结构参数初步方案,建立对应的三维数值计算模型,将围岩的变形、应力分布及塑性区大小等作为衡量采场结构参数优劣的指标。根据模拟结果对比分析了各方案在矿房回采后采场围岩的力学响应情况,得到了采场处于最有利力学状态时的结构参数,结合各方案盘区矿石理论回采率,进而对采场结构方案进行了优选,即当顶柱厚度为6 m,矿房跨度38 m,矿柱宽14 m时,采场结构稳定性处于最有利状态并且具有较高的理论回采率。优化结果可为后续开采设计提供参考。

To safely and efficiently mining the ore under large cemented filling body,reasonable stope structure is the first issue that need to consider in mining design. On the basis of comprehensive analysis on geological situation and current mining technical condition of some underground mine,stope structure parameters were calculated by using empirical method with theoretical calculation,and four kinds of the preliminary scheme about the stope structure were put forward. Then,the corresponding 3-dimensional numerical model is established,where the deformation,stress distribution of surrounding rock and the plastic zone size were taken as indicators to measure the performance of stope structure parameters. Based on the simulation results,the mechanical response of the various programs in the stope wall rock after room mining are comprehensively analyzed,obtaining the structural parameters under the most favorable mechanical state of the stope. Combining with the theoretical recovery rate of each panel,the programs of stope structure were optimized,that is,when the thickness of top column is at 6 m,the stope span at 38 m and the pillar width at 14 m,stope structural stability keeps in the most favorable state and the stope has a high theoretical recovery rate. The optimized results could provide reference for the follow-up mining design.