摘要
重叠矿体开采的相互作用和响应规律是影响矿山开采安全的重要因素。以镜铁山桦树沟铜矿与上部铁矿体的重叠矿段为研究对象,采用3DMine-Midas-FLAC3D耦合精细建模数值模拟技术,结合矿山实际工程和采充工序条件,建立了充填矿段铜矿体开采条件下的FeV矿体工程响应数值分析模型,获得了FeV矿体回采巷道等工程结构的位移和应力响应规律,对FeV矿体的开采进行了安全评价和分析。研究结果表明:(1)试验采场的采充过程中,FeV回采巷道2 865 m水平所受开挖扰动最大,最大位移达到2.3 cm,应力最大扰动幅度为11.34%,最大剪应力为1.27 MPa;(2)采充过程中,空区上方中心部分的Z方向应力会减小,应力向四周转移;空区上方中心位置剪应力无明显变化,剪应力在空区边缘变化明显;(3)在试验采场开采过程中,上部FeV矿体的2 880 m和2 895 m水平回采巷道处于稳定状态,建议矿山加快回采进度,实现强采强出,提高矿石回收率。
The interaction and response law of overlapping-orebody mining are important factors that have significant influence on mining safety.The overlapping-orebody of Huashugou copper mine in Jingtieshan area where the upper iron orebody adjoins the under copper orebody was chosen as the research objects.Based on the coupled 3D Mine-Midas-FLAC3D technology,combined with practical mining and filling process of the mine,a numerical analysis model for the response of FeV orebody engineering under the condition of copper orebody in the filling section was established. Then the data including displacement and stress of stoping tunnel of FeV orebody were obtained and were used to analyze the mining process of FeV orebody. Results show that maximum excavating perturbation during mining and filling process of research area occurs in 2 865 m stoping tunnel,and the maximum displacement is 2.3 cm,the maximum amplitude of stress is 11.34% and the maximum shear stress is 1.27 MPa,respectively. The Z axis stress in the center of cavity roof remains decreasing,and it transfers to all round.The shear stress in the center of cavity roof keeps unchanged while it around the edge of cavity changes drastically.During the mining process of test stope,2 880 m and 2 895 m stoping tunnel above FeV orebody are in steady state.Consequently,stoping process can be accelerated to boost productivity,so as to improve the recovery rate of ore.
作者
胡建华
高晨
杨春
HU Jianhua;GAO Chen;YANG Chun(School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China)
出处
《黄金科学技术》
CSCD
2018年第6期736-743,共8页
Gold Science and Technology
基金
国家科技支撑计划课题"深部多层重叠矿体高效开采与灾害控制关键技术研究"(编号:2015BAB12B01)
国家自然科学基金项目"深部采动下地质结构体跨尺度时变力学行为试验及机理"(编号:41672298)联合资助
关键词
应力
位移
监测
重叠矿段
开采扰动
精细建模
仿真
安全评价
stress
displacement
monitoring
overlapping-orebody
mining disturbance
fine modeling
simulation
safety evaluation
