某露天煤矿粉质黏土边坡稳定性分析及治理

Stability analysis and treatment of silty clay slope in one open-pit coal mine

某露天煤矿首采区剥离工作开始至今,已经先后发生多次比较大规模的与粉质黏土有关的塌方(滑坡)事故,通过对边坡现场工程地质勘察,结合室内岩石力学实验,得到了土力学参数建议值。根据勘察钻孔的分布,合理分区,选取典型剖面,运用极限平衡分析方法分析各剖面的稳定性,得到各剖面的安全系数,并将采区划分稳定区、基本稳定区、不稳定区。针对边坡进行稳定性分析结果,结合粉质黏土特性,提出经济、合理、安全的粉质黏土边坡治理方案。

Since the first mining area was stripped in one open-pit coal mine there has been conducted the occurrence of several relatively large-scale landslides related to silty clay (landslide)accidents.Through the pre-site engineering geological investigation in conjunction with indoor rock mechanics experiments, excavated mechanical parameters to recommended values.According to surveying the distribution of drilling, divide a reasonable partition,select the typical profile.Using limit equilibrium method to analyze the stability of each section mining area was divided into stable area,basic stable area and unstable area.For the slope stability analysis,combined with the characteristics of silty clay,forward economic,reasonable and safe treatment of silty clay slope was proposed.