含软弱夹层露天矿高边坡台阶宽度及台阶坡面角协同优化研究

采用工程类比法建立露天矿开采中台阶宽度及台阶坡面角协同优化循环流程图,采用强度折减法,以含软弱夹层的四川黄山石灰石露天矿山高边坡为例,计算不同台阶宽度及台阶坡面角方案下边坡稳定性系数,探讨软弱夹层对边坡稳定性的影响,最终确定合理的台阶宽度及台阶坡面角取值。结果表明,循环流程图更为清晰直观地展示了台阶宽度及台阶坡面角协同优化的整个过程,可直接获得台阶宽度及台阶坡面角组合大小; 软弱夹层大大降低了边坡稳定性,且易成为潜在滑动面; 该矿山边坡3-3'剖面的最优安全平台宽度、清扫平台宽度及台阶坡面角分别为4 m、8 m和64°。研究成果可为矿山实现安全经济生产提供新思路和指导作用。

Collaborative Optimization of Bench Width and Bench Face Angle for High Slope with Weak Interlayer in Open-Pit Mine

Taking a high slope with weak interlayer in an open-pit mine of Huangshan limestone in Sichuan Province as an example, a circular flow diagram was established by adopting engineering analogy method for collaborative optimization of bench width and bench face angle, and the stability coefficient of slope with different bench width and bench face angle was calculated by using the strength reduction method. Based on the discussion of the influence of weak interlayer on the slope stability, a reasonable bench width and a bench face angle were finally determined. It is found that this circular flow diagram can present the whole process of collaborative optimization of bench width and bench face angle in a clear and intuitive way, and also can directly give a combination of bench width and bench face angle. The weak interlayer greatly reduces the slope stability and is prone to be a potential sliding surface. It is concluded that the optimal width for the safety platform and the cleaning platform of the 3-3' section of the mine slope should be 4 m and 8 m, while the bench face angle is preferably 64°. This research can provide some new ideas and reference for mines' safe and economic production.