龙首矿高应力坑底隔离矿柱失稳模式  

Instability Pattern of High Stress Isolation Pillar of Pit Bottom in Longshou Mine

作　　者：仪海豹[1,2] 李明 辛国帅[1] 潘祖瑛[1] 汪禹 何建元[3] 

机构地区：[1]中钢集团马鞍山矿山研究院有限公司,安徽马鞍山243000 [2]北京科技大学土木与资源工程学院,北京100083 [3]金川集团有限公司龙首矿,甘肃金昌737100

出　　处：《金属矿山》2017年第9期47-51,共5页Metal Mine

基　　金："十二五"国家科技支撑计划项目(编号:2012BAB08B02)

摘　　要：以金川龙首矿坑底隔离矿柱为研究对象,采用ANSYS和FLAC^(3D)软件相结合的方式,建立了矿区大型三维数值分析模型;通过岩体位移反分析,确定了合理的矿岩计算物理力学参数;从塑性区分布、最大主应力变化及能量演化3个角度,分析了坑底隔离矿柱的破坏模式。研究表明:隔离矿柱塑性区面积随地下开采活动表现为"增加—稳定—减小"的变化趋势,塑性屈服变化较为稳定;最大主应力表现为震荡性缓慢增加趋势,不会形成高应力集中和高应变能聚集;同时在大规模的充填体的应力吸收和转移作用下,隔离矿柱的能量耗散速度得以减缓,使其能量的积聚与耗散维持在一个动态平衡状态,其变形破坏模式是渐进式的,不会产生灾害性突变失稳破坏。Taking the the isolation pillar of Longchang Mine in Jinchuan as the study example,combing with numerical simulation software ANSYS and FLAC^（3D）,the large-scale three-dimensional numerical analysis model is established. The rational physical and mechanical parameters of rock are obtained by conducting the displacement back-analysis. The failure pattern of isolation pillar of pit bottom is analyzed from the three aspects of plastic zone distribution,the maximum principal stress variation and energy evolution. The study results show that： the plastic zone areas of isolation pillar show the trend of ＂ increasestabilize-decrease＂ with the underground mining activity,and the variety of plastic zone area is stable; the maximum principal stress show a slow increasing trend of concussion without high stress concentration and high strain energy accumulation; meanwhile,the energy dissipation rate of isolation pillar is slowed down by the stress absorption and transfer of large-scale filling body,therefore,the accumulation and dissipation of energy can be maintained in a dynamic equilibrium state in the isolation pillar. The deformation failure mode of the isolation pillar is gradual,and it can not produce catastrophic instability.

关 键 词：隔离矿柱 塑性区分布 能量演化 数值分析 渐进性破坏 失稳模式 

分 类 号：TD862[矿业工程—金属矿开采]