露天矿软弱基底排土场边坡稳定分析及治理措施

Slope stability analysis and control measures of soft base dump in Open-pit Mine

为研究露天矿外排土场边坡稳定性,以某露天矿为例,依据工程地质勘察成果和排土场初步设计,确定排土场岩土体物理力学指标,并建立典型工程地质模型。根据典型工程地质模型,利用有限元方法进行边坡潜在滑坡模式分析,运用极限平衡理论进行稳定性计算。结果表明:排土场潜在滑坡模式为沿排土场基底(第四系)的“坐落滑移式”滑动,边坡稳定系数不满足安全储备系数的要求。最终确定了排土场边坡底部境界压脚治理措施,在保证边坡稳定的前提下,提高了排土场的收容量、减少了排弃物料的运距。

In order to research the slope stability of the open-pit mine,taking the open-pit mine as an example,according to the engineering geological survey results and the preliminary design of the dump,the article determines physical and mechanical indexes of the rock,and establishes a typical engineering geological model.According to the typical engineering geological model,we carry out potential landslide model analysis by finite element method and the stability calculation by using the limit equilibrium theory.The results show that the potential landslide mode of the waste dump is"sitting sliding"sliding along the base of the waste dump(Quaternary System),and the stability coefficient of the slope does not meet the requirements of the safety reserve coefficient,the treatment measures for the bottom boundary presser foot of the waste dump are determinedfinally.On the premise of ensuring the stability of the slope,the collection capacity of the waste dump is increased and the transportation distance of the waste materials is reduced.