永平铜矿露天转地下开采过程地压分布特征研究  

Distribution Characteristics of Ground Pressure during Open-Pit to Under⁃ground Mining in Yongping Copper Mine

作　　者：胡天寿 涂帆 姜明媚 王旭刚 蔡永顺 HU Tianshou;TU Fan;JIANG Mingmei;WANG Xugang;CAI Yongshun(Yongping Copper Mine,Jiangxi Copper Co.,Ltd.,Shangrao 334505,China;BGRIMM Technology Group,Beijing 100160,China)

机构地区：[1]江西铜业股份有限公司永平铜矿,江西上饶334505 [2]矿冶科技集团有限公司,北京100160

出　　处：《铜业工程》2025年第2期85-94,共10页Copper Engineering

基　　金：国家重点研发计划项目(2022YFC2904102)资助。

摘　　要：永平铜矿露天转地下开采后,地下矿体回采将影响西部露天边坡、南部排土场、Ⅱ号矿体北段露采与地采之间隔离矿柱、地下断层附近采场的稳定性。本文结合矿山工程地质条件、采矿设计规划等资料,采用FLAC3D软件建立了永平铜矿地下开采过程的数值模拟计算三维模型,研究了地下开采过程地压分布特征以及地下开采对上述区域稳定性的影响。研究表明:Ⅱ号矿体北部回采过程中可能会引起上盘围岩与隔离矿柱发生错动,Ⅱ号矿体南部回采过程中潜在的破坏区域集中在采场周边,Ⅳ号矿体上部回采过程中露天坡脚处应力变化明显,Ⅳ号矿体下部受F2断层控制在回采过程中采场端部易出现应力集中,二步骤回采矿柱导致的围岩位移约占总位移量的60%~80%。总体来说,上述区域在开采过程中均出现了不同程度的应力集中与变形等潜在地压风险,在后续开采过程中应加强对地压风险区域的监测,同时研究结果也为地压监测方案设计提供了技术支撑。After Yongping Copper Mine is transformed from open pit to underground mining,underground mining will affect the stability of the western open pit slope,the southern dump,the isolation pillar between open pit and underground mining of the northern part of orebodyⅡ,and the underground stope near the fault.In this paper,a 3D numerical simulation model of underground mining process of Yongping Copper mine is established by using FLAC^(3D)software based on the data of mine engineering geological conditions and mining design planning.The distribution characteristics of ground pressure and the influence of underground mining on these areas described above.The research shows that:In the mining process of the northern part of orebodyⅡ,it may cause misalignment of the hanging wall surrounding rock and isolated pillar.In the mining process of the southern part of orebodyⅡ,the potential failure area is concentrated around the stope.In the mining process of the upper part of orebodyⅣ,the stress change at the foot of open slope is obvious.In the mining process of the lower part of orebodyⅣ,which is controlled by F2 fault,and the end of stope is prone to stress concentration.The displacement of surrounding rock caused by pillar mining in the second step accounts for 60%~80%of the total displacement.In general,potential ground pressure risks such as stress concentration and deformation have appeared in the above areas in the mining process.Monitoring of ground pressure risk areas should be strengthened in the subsequent mining process.The research result also provides technical support for the design of ground pressure monitoring plan.

关 键 词：露天转地下 地压分布特征 FLAC3D 数值模拟 

分 类 号：TD853[矿业工程—金属矿开采]