School of Mining, Liaoning Technical University, Fuxin , China

针对顺倾软弱基底内排土场边坡的空间形态问题,以白音华三号露天矿为工程背景,基于刚体极限平衡与三维数值模拟的手段,分析了内排角度及内排土场发展至不同工程位置对内排土场边坡稳定性的影响。研究结果表明:白音华三号露天矿内排土场边坡滑坡机理为基底弱层在排弃物料自身重力作用下产生塑性屈服,与排弃物料内部产生的滑面贯通,形成以剪切圆弧为侧界面、基底弱层为底界面的切层-顺层滑动;内排土场边坡参数为内排推进距离1 000 m,内排角度14°,平盘宽度67 m时满足安全要求;顺倾软弱基底内排土场边坡随着内排边坡角的减小及推进距离的增加,内排土场边坡稳定性近线性增加,且内排边坡角对边坡稳定性的影响较显著,据此可确定顺倾软弱基底内排土场边坡的空间形态。

According to the spatial morphology problem of the slope in the in pit dumping site at inclined weak-basement, taking Baiyinhua No. 3 surface mine as an engineering background, based on the means of the rigid body limit equilibrium and the 3D numerical simulation, the paper had an analysis on the in pit dumping angle and the in pit dumping site development to the different engineering location affected to the slope stability of the in pit dumping site. The results showed that the landslide mechanism of the slope in the in pit dumping site of Baiyinhua No. 3 Surface Mine was that a plastic yield was occurred in the weak layer of the basement under the self gravity role of the dumping material. And the sliding surface linkage was occurred from the inner of the dumping material and would form a shearing layer-bedding sliding with a shearing arc as the lateral interface and the base floor as a bottom interface. The slope parameters of the in pit dumping site could meet the safety requirements when the in pit pushing distance was 1 000 m, the in pit dumping angle was 14° and the bench width was 67 m. The slope of the in pit dumping site with a bedding inclined weak-basement would be reduced with the in pit dumping slope angle and would be increased with the pushing distance. The slope stability of the in pit dumping site would be increased linearly. The in pit dumping angle would have obvious influences to the slope stability. Therefore,the spatial morphology of the slope in the in pit dumping site at inclined weak-basement could be determined.