某露天矿山边坡稳定性分析及参数优化

Slope stability analysis in an open-pit stope and parameter optimization

露天采场边坡角的选取是露天开采境界确定的首要前提。针对某露天采场普遍存在边坡角较小,露天边坡压覆较多资源的情况,结合矿山岩石力学情况及矿体赋存条件,对现有边坡角进行优化,确定最优边坡角。采用CAD与有限元软件耦合的方式创建生成模型,采用摩尔-库仑本构关系选取具有代表性的剖面,结合开挖过程中不同台阶的位移变化,进行稳定性分析,确定露天采场终了边坡角为38°~42°,为矿山开采方案优化提供依据。

The selection of open-pit stope slope angle is the priority prerequisite to determine open-pit mining boundary.In light of small slope angles and much resource occupied by open-pit slope which is commonly incurred in open-pit stopes,the existing slope angle is optimized to determine optimal slope angle based on rock mechanics and ore body occurrence state in mines.CAD and finite element software are coupled to create the model,and Mohr-Coulomb constitutive relation is used to select several representative sections and analyze the stability based on the displacement variation of different steps during the excavation,and the final slope angle is determined to be 38°-42°.The study provides basis for mining plan optimization.