凸型边坡露天境界外矿体开采稳定性研究

Study on Mining Stability of Ore-body Outside Convex Slope Boundary

针对永平铜矿开采临近西部边坡矿体以维持矿山产量和延长矿山服务年限而导致边坡稳定性降低的问题,采用ANSYA软件对不同开采阶段进行数值模拟,研究各阶段采场开采对边坡和采空区稳定性的影响。模拟结果表明:开采同一阶段时,边坡稳定性和采场应力集中现象由南往北呈现先增加后减小的趋势,边坡和采场稳定性也相应变化;开采同一位置不同阶段的采场时,边坡部位应力相差较小,采场顶底板处应力集中范围和大位移分布范围随着开采高度的增加而减小;开采0,+50,+100和+150 m中段各采场时边坡和采空区未发生失稳大变形,可按设计进行开采。

Aiming at the problem that the slope stability is reduced when the mining of Yongping Copper Mine is close to the west slope orebody to maintain the mine output and prolong the service life of the mine,ANSYA software is used to conduct numerical simulation for different mining stages to study the influence of stope mining on the stability of the slope and mined-out area. The simulation results show that at the same mining stage,the slope stability and stope stress concentration firstly increase and then decrease from south to north,and the slope and stope stability also change correspondingly. When mining stopes at the same horizontal position in different stages,the stress difference at the slope is small,and the stress concentration range and large strain distribution range at the top and bottom of the stope decrease with the increase of mining height. No large deformation of slope and mined-out area occurred when mining at 0,+50,+100 and +150 m sections,so mining can be carried out according to design.