西部某露天高陡矿山边坡稳定性分析及影响因素研究

Stability analysis and influencing factors of an open-pit high steep mine slope in western region

西部地区矿山资源丰富,地质条件复杂,使得该地区的边坡稳定性分析问题备受关注。本文以西部地区某露天金属矿山边坡为研究对象,根据边坡形态、地层岩性、构造、水文和风化程度等工程地质条件,划分3个边坡分区,每个分区选取1~2条代表性剖面。在现场勘察的基础上,采用室内试验和数值模拟方法开展边坡稳定性分析研究工作。对研究区4种主要岩性开展必要的岩石物理力学试验,采用Hoek-Brown强度折减法用于计算岩体的抗剪强度参数;对研究区地下水作用下的渗流场进行分析,在此基础上采用两种不同的极限平衡分析方法计算边坡稳定性。研究结果表明,在3种不同工况下计算的安全系数均满足规范要求。

Mine resources are rich in the western region and geological conditions are complex,so the problem of slope stability analysis in this region has attracted much attention.In this paper,the slope of an open-pit metal mine in western China is taken as the research object.According to the engineering geological conditions such as slope form,formation lithology,structure,hydrology and beauty degree,the slope is divided into 3 zones,and 1~2 representative sections are selected for each zone.On the basis of field investigation,the slope stability analysis is carried out by means of laboratory test and numerical simulation.The necessary rock physical and mechanical tests are carried out for the four main lithologies in the mining area.The Hoek-Brown strength reduction method is used to calculate the shear strength parameters of the rock mass.The seepage field under the action of groundwater in mining area is analyzed,and two different limit equilibrium analysis methods are used to calculate the stability of slope.The results show that the calculated safety factors under three different working conditions meet the requirements of the code.