多层采空区下深部矿体开采对上盘竖井稳定性的影响

Influence of Deep Mining Under Multilayer Goaf on the Stability of Hanging Shaft

为研究多层采空区下深部矿体开采对竖井稳定性的影响,以内蒙古某金矿为工程背景,采用数值模拟分析方法,建立三维数值计算模型,利用实测的岩体力学参数,模拟矿山动态开采过程,得到深部矿体开采后竖井井筒围岩位移变形规律、应力分布特征和塑性区分布特征。研究结果表明:随着深部矿体的开采,上盘竖井围岩变形程度明显增大,尤其是井筒下部区域;采空区围岩最大主应力和最小主应力均呈现增大的趋势,但竖井附近的应力仍基本呈原岩应力状态;剪切破坏的塑性区体积呈增大趋势,需及时做好采空区处理工作,以保证矿山的持续安全生产。

In order to study the influence of deep mining under multilayer goaf on the shaft stability,taking agold mine in Inner Mongolia as the engineering background,a three-dimensional numerical calculation model was established by numerical simulation analysis method.The dynamic mining process was simulated by using the measured rock mechanics parameters.The displacement and deformation law,stress distribution characteristics and plastic zone distribution characteristics of shaft surrounding rock after mining deep ore body were obtained.The research results are concluded as follows.Firstly,with the mining of deep ore body,the deformation degree of hanging shaft surrounding rock increases obviously,especially in the lower part of shaft.Secondly,the maximum and minimum principal stress of surrounding rock around the goaf shows an increasing trend,but the stress state near the shaft still basically presents the original rock stress state.Thirdly,the volume of plastic zone with shear failure is increasing,so it is necessary to treat the goaf in time,so as to ensure the continuous and safe production of the mine.