地应力作用下金属矿山崩落区断层稳定性分析  

Fault Stability Analysis of Metal Mine Caving Area under In-situ Stress

作　　者：周占星 胡绍辉 李寿杰 周航海 ZHOU Zhanxing;HU Shaohui;LI Shoujie;ZHOU Hanghai(China Jiangxi International Economic and Technical Cooperation Co.,Ltd.;School of Resources and Safety Engineering,Central South University)

机构地区：[1]中国江西国际经济技术合作有限公司 [2]中南大学资源与安全工程学院

出　　处：《现代矿业》2024年第1期78-81,86,共5页Modern Mining

摘　　要：金属矿山长期采用崩落法回采矿石,形成了大量崩落区,在长期的应力集中、风化作用及爆破振动影响下,崩落区岩层稳定性持续降低,进而产生变形直至发生破裂形成断层,从而严重影响矿山安全生产。为研究地应力作用下金属矿山崩落区断层稳定性及相关参数变化规律,以狮子山铜矿深部开采为背景,采用大型商业有限元软件LS-DYNA计算地应力作用下崩落区断层位移、有效应力及损伤。研究结果表明,崩落区断层位移、有效应力和损伤程度会随断层所处深度的增加而增大,随着距崩落区边界距离的增大而减小;在构造和自重应力作用下,断层处的应力集中会使该弱面结构产生较大损伤,且断层越深,潜在的危险性越大;为提高采场结构稳定性,应加强对断层结构监测。研究结果为预测崩落区断层稳定性及矿山安全生产提供参考。A large number of caving areas will be formed when metal mines adopt caving method for a long period of time.Under the influence of long-term stress concentration,weathering and blasting vibra⁃tion,the stability of rock strata in the caving area will continue to decrease,and then deformation will occur until rupture and fault will be formed,which seriously affects the safety of mine production.In order to study the stability of fault and the variation law of related parameters in the caving area of metal mine under the ac⁃tion of ground stress,taking the deep mining of Shizishan Copper mine as the background,a large commer⁃cial finite element software LS-DYNA was used to calculate the fault displacement,effective stress and damage in the caving area under the action of ground stress.The results show that the fault displacement,ef⁃fective stress and damage degree increase with the increase of the depth of the fault,and decrease with the increase of the distance from the boundary of the caving area.Under the action of structural and gravity stress,the stress concentration at the fault will cause great damage to the weak surface structure,and the deeper the fault is,the great the potential risk.In order to improve the stability of stope structure,it is neces⁃sary to strengthen the monitoring of fault structure.The research results provide reference for predicting fault stability in caving area and mine safety production.

关 键 词：地应力 崩落区 断层稳定性 数值模拟 

分 类 号：TD853.36[矿业工程—金属矿开采]