新城金矿竖井保安矿柱的三维圈定与模拟回采

竖井周边矿体的开采对竖井的稳定性有重要影响。新城金矿Ⅺ#矿体在主竖井下部,首先应用三维软件圈定了竖井保安矿柱并统计压矿量。统计结果显示,依据规范圈定的竖井保安矿柱导致Ⅺ#矿体大部分资源不能被回采。针对这一问题,在Ⅺ#矿体与竖井三维模型的基础上,建立了FLAC3D数值计算模型,并按2种方案进行了模拟回采。数值模拟结果表明:Ⅺ#矿体保安矿柱内部矿石回采具有可行性,回采造成的塑性区主要集中在采空区周围以及充填体内部;回采将导致竖井底部变形较大、应力集中较突出,是关注的重点区域。研究结果为竖井周边矿体的开采提供了理论指导,具有重要的实践意义。

3D Delineation of the Shaft Safety Pillar of Xincheng Gold Mine and Its Numerical Excavation

The extraction of ore-bodies around the shaft has an important influence on the shaft stability.The X# ore-body of Xincheng Gold Mine is below the shaft.The safety pillar is delineated and the reserves of the unworkable quantity of ore reserve is calculated by adopting the 3D mining software.The results show that a mass of ore cannot be excavated according to the shaft safety pillar delineated by some existing specifications.In order to solve the problem,based on the 3D model of X# ore-body and shaft,the numerical calculation mode is established by using the FLAC3D software,the numerical excavation is conducted based on two schemes.The numerical simulation results show that:①it is feasible to excavate the internal ore of the shaft safety pillar,the plastic zones caused by excavation is mainly distributed around the mined-out area and the internal of filling body;②the deformation is large at the bottom of shaft,where the stress concentration is also prominent,therefore,the shaft bottom area should be concerned emphatically.The above analysis results of this paper can provide some theoretical guidance for the ore-body mining around shaft,besides that,its practical significance is significant.