抚顺西露天矿北帮边坡渗流稳定性分析

Analysis on north slope seepage flow stability in Fushun West Open-pit Mine

为分析抚顺西露天矿北帮边坡受持续降雨影响后边坡内部孔隙水压力的变化及边坡稳定性的变化,基于现有平面图及以往地质资料,建立了北帮E3200剖面的工程地质简化模型及计算模型,通过Fredlund-Xing模型、数值模拟、极限平衡理论等研究方法与手段,对降雨7 d过程中的边坡孔隙水压力进行模拟。结果表明:随着降雨量的不断增多,边坡地下水位线上升,同时坡面处的孔隙水压力数值不断增大,内部岩土体力学抗剪强度降低,在降雨到第7 d时边坡处于极限平衡状态。

In order to analyze the change of pore water pressure and slope stability in the north slope of Fushun West Open-pit Mine after continuous rainfall,based on the existing plan and previous geological data,the article establishes a simplified engineering geological model and calculation model of the north slope E3200 profile.Through Fredlund Xing model,numerical simulation,limit equilibrium theory and other research methods and means,the article simulates pore water pressure of the slope during 7days rainfall process.The results show that with the increasing rainfall,the groundwater level of the slope rises.At the same time,the pore water pressure value at the slope surface increases continuously,and the mechanical shear strength of the internal rock and soil mass decreases.The slope is in a limit equilibrium state when the rainfall reaches the seventh day.