露天矿内排土场堆叠过程中边坡形态优化

Optimization Design of Slope Shape During Stacking Process of Inner Dump in Open Pit Mine

针对露天矿内排土场在堆叠过程中的边坡形态问题,以哈尔乌素露天矿内排土场为工程背景,应用刚体极限平衡软件定量分析了内排土场堆叠至不同高度时的边坡稳定性及其潜在滑坡模式,采用数值模拟软件FLAC3D对内排土场边坡进行模拟分析,揭示了内排土场边坡的变形破坏形式及其滑坡机理。结果表明:哈尔乌素露天矿内排土场的潜在滑坡模式及其稳定性主要受基底弱层的控制;优化后排弃至1025平盘时边坡角度为18°、排弃至1095平盘时边坡角度为17°、排弃至1165平盘时边坡角度为16°、排弃至1200平盘时边坡角度为16°;内排土场边坡的滑坡机理为基底赋存的弱层在排弃物料的自重作用下产生塑性屈服,其与排弃物内部产生的滑裂面贯通时,边坡岩体发生剪切破坏并沿内排土场基底弱层挤出。

For the problems of slope shape during stacking process of inner dump in open pit mine,taking the inner dump of Haerwusu Open Pit Mine as the engineering background,the inner dump slope stability and the potential landslide are quantitatively analyzed by using rigid body limit equilibrium software,and the analysis of inner dump slope by numerical simulation software FLAC3D reveals the mechanism of deformation and destruction of the inner dump slope.The results of our study indicate that the potential landslide model and stability of inner dump in Haerwusu Open Pit Mine are mainly controlled by the weak layer of basement;the slope angle is 18°,17°,16°,16°when the abandoned materials are discharged to 1025 flat disk,1095 flat disk,1165 flat disk,and 1200 flat disk respectively after the slope shape optimization;the landslide mechanism of the slope of the inner dump is that the weak layer produces plastic yield under the self-weight of the dumping material,and the sliding surface linkage occurred from the inner of the dumping material,the rock mass of the slope is shearing and extruding along the weak layer of the base of the inner dump.