高寒地区露天矿排土场稳定性分析研究*

为分析高寒地区露天排土场稳定性，以乌努格吐山铜钼矿排土场为工程背景，结合室内试验并利用GeoStudio及FLAC3D软件对边坡进行模拟计算分析，给出边坡治理有效措施。结果表明:前3次冻融循环对散体物料的抗剪强度影响显著，后期影响则趋于稳定；6个剖面的安全系数普遍大于1.2，在地下水的干扰下，各剖面安全系数普遍下降，尤其是剖面E-E，其安全系数低于1，存在滑坡风险；水对边坡的安全性影响较大，其次提出削坡治理及布置抗滑桩措施，当边坡角度削减至31°时，边坡的安全系数增至为1.383；抗滑桩增至8根时，安全系数增加至1.296，这些措施对边坡的治理皆起到积极作用。研究结果可为高寒地区矿山安全开采提供技术支持。

Study on stability analysis of waste dump of open-pit mine in alpine area

In order to analyze the waste dump of open-pit mine in alpine area,taking the dump of Wunugetushan copper and molybdenum mine as the engineering background,combined with the laboratory tests,the slope was simulated and analyzed by using GeoStudio and FLAC3D software.Combined with the research results,the slope treatment measures were given.The results showed that the first three freeze-thaw cycles had significant influence on the shear strength of granular materials,and the influence tended to be stable in the later period.The safety factor of slope under different working conditions was calculated,and the safety factors of six sections were generally greater than 1.2.Under the interference of groundwater,the safety factor of each section generally decreased,especially the safety factor of section E-E,which was lower than 1,and there existed the risk of landslide.Water had great influence on the safety of slope.Then,the measures of slope cutting and anti-slide pile arrangement were proposed.When the slope angle was reduced to 31°,the safety factor of slope increased to 1.383.When the number of anti-slide piles increased to 8,the safety factor increased to 1.296,which both played a positive role in the slope treatment. The research result provides technical guarantee for the safe mining of mines in cold areas.