阶段空场嗣后充填采矿法采场长度优化及工程应用

Stope Length Optimization and Engineering Application of Stage Open Stope with Subsequent Filling Mining Method

为优化某铁矿阶段空场嗣后充填采矿法的采场长度,提高矿山安全生产水平和生产效率,采用FLAC3D构建了采场数值模型,分析不同开挖步骤下,矿房顶板和侧帮的应力、位移、塑性破坏区变化对矿房稳定性的影响,并对采场的结构参数进行优化。研究结果表明,在巷道未支护的情况下,当开挖长度达到36 m时,顶板最大拉应力超过该区域矿石的抗拉强度,侧帮最大拉应力值超过该区域矿石的抗拉强度,顶板拉伸剪切破坏塑性区逐渐增大,且有贯通趋势,此时采场的顶板和侧帮均逐渐失去稳定。因此,在考虑经济效益和巷道未进行支护的情况下,建议采场长度不宜超过36 m。

To optimize the stope length for a mine using stage open stope with subsequent filling mining method,so as to improve safety and efficiency of production,a numerical model of the mining area was constructed using FLAC3D to analyze the impacts of stress,displacement,and plastic failure zone of the roof and side walls on the stability of the mining area under different excavation steps.And the structural parameters of the mining area were optimized.The research results indicate that when the excavation length reaches 36 m without support in the roadway,the maximum tensile stress of the roof exceeds the tensile strength of ores in this area,and the maximum tensile stress value of the side slope exceeds the tensile strength of the ore in the area.The plastic zone of the roof tensile shear failure gradually increases and there is a trend of continuity.At this time,the roof and side slope of the mining area gradually lose stability.Therefore,considering economic benefits and the lack of support in the roadway,the stope length is suggested as no more than 36 m.