因民铜矿大水沟矿段地下开采对主副竖井的稳定性影响分析

Influence Analysis of Underground Mining on the Stability of Main and Auxiliary Mineshaft in Dashuigou Section of Yinmin Copper Mine

为确保地表主副井的稳定,采用有限差分程序FLAC3D模拟地下矿体开采对主副井稳定性的影响。计算了矿体开采过程中地表及主副井的下沉变形量,并参照我国评判采空区场地稳定性等级标准进行评判。模拟结果表明:岩层移动是一个自下而上传递的动态过程,地下开采对上部主副井产生的下沉变形量很小,未超过10 cm的地表下沉控制标准;同时地下开采也未在主副井所处的围岩产生塑性扰动区,说明主副井处于安全稳定的状态。研究结果为地下采场的布置设计和主副井安全运行提供了指导性的依据。

To ensure the safety of the main and auxiliary mineshafts,the paper analyzed the influence of underground mining on the main and auxiliary mineshaft through FLAC3D simulation.Subsidence deformation of surface and mineshaft in process of deposit body exploitation were calculated,and judgement were made according to the grade evaluation criteria for stability of goaf site in China.Simulation results show that strata movement is a dynamic process of transfer from bottom to top,and subsidence deformation of main and auxiliary mineshaft is very small,and the control standard of surface subsidence is less than 10 cm.At the same time the surface and mineshaft do not produce the plastic disturbed zone,which illustrates the mineshaft is in a stable state.The research results provide the guiding basis for stope design and safe operation of main and auxiliary mineshaft.