充填体与岩体强度合理匹配下的采场结构参数优化  

Optimization of Stope Structure Parameters based on Strength Match between Backfill and Rock Mass

作　　者：杨蕾[1] 邱景平[1] 邢军[1] 孙晓刚[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《金属矿山》2016年第3期10-14,共5页Metal Mine

基　　金："十二五"国家科技支撑计划项目(编号:2011BAB07B02;2012BAJ17B01;2012BAJ17B02)

摘　　要：选取合理的充填配比和采场结构参数是采用阶段空场嗣后充填采矿法矿山实现安全回采和提高生产效率的有效措施。根据岩体开挖释放能量与充填体峰值变形能相近的原则,确定了符合中关铁矿的最佳充填配比为1∶6。在此充填配比下,针对中关铁矿的开采技术条件,对影响采场稳定性的矿房长度、矿房跨度和顶板厚度这3个因素进行了3因素3水平的正交试验设计,得到9种试验方案。运用FLAC3D对9种不同方案的采场结构参数进行模拟计算,分析对比了各方案矿房回采充填后采场顶板和充填体矿柱的应力及位移分布情况,研究了各因素对采场稳定性的影响顺序,进而对采场结构参数进行了优选。计算结果表明:矿房长度和矿房跨度是影响采场稳定性的重要因素,最优的结构参数为矿房长度50 m、矿房跨度18 m、顶板厚度8 m,该结构参数下能够保证采场的稳定性且能有效提高矿山生产能力。For mines that adopt stage open stoping with subsequent filling,reasonable selection of cement-tailing ratio and stope structure parameters plays a key role in realizing safe mining and improving production efficiency. According to the principle that peak deformation energy of backfill should be corresponded to releasing energy from excavated rock mass,the optimum backfill ratio of Zhongguan Iron Mine was determined to be 1 ∶ 6. Under this ratio,and based on the mine＇s mining condition,three-level and three-factor orthogonal experiment was designed to research how the room length,room width and top pillar height affecting stope stability. FLAC3 Dsoftware was used to simulate the 9 different structure parameters,and the changes of stress and deformation of top pillar and backfill pillar after backfill were analyzed. The influence sequence of three factors in affecting stope stability was studied,and then the structure parameters were optimized. The calculation results showed that room length and width were important influence factors of stope stability,the optimal room length,room width,and top pillar height were determined as 50 m,18 m,8 m respectively. The mine could ensure stope stability and improve its production capacity effectively under these structure parameters.

关 键 词：阶段空场嗣后充填采矿法 强度匹配 数值模拟 正交试验 采场结构参数 

分 类 号：TD853[矿业工程—金属矿开采]