考虑水平地应力作用的边坡三维极限平衡法研究  

Three-dimensional limit equilibrium method for slopes under horizontal geo-stress

作　　者：谭文辉[1] 孙中华[1] 李聪聪[1] 李宁[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083

出　　处：《采矿与安全工程学报》2015年第4期683-688,共6页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51034001);教育部留学回国人员科研启动基金项目

摘　　要：随着露天矿山开采深度的不断增加,地应力成为影响边坡稳定性的重要因素。基于改进的Spencer法,推导并建立了考虑水平地应力作用的边坡三维极限平衡计算公式和程序,以首铁水厂铁矿边坡为例进行了应用分析,并与基于强度折减法的FLAC3D数值分析结果和现场监测结果进行了对比研究。研究表明:无论是边坡三维极限平衡分析还是数值模拟,考虑水平地应力作用得到的安全系数都比不考虑水平地应力作用得到的安全系数小,得出的边坡临界滑体尺寸偏大;数值模拟中,考虑地应力作用时得到的位移与边坡现场监测位移更为接近。因此,在深凹高陡边坡稳定性分析中必须考虑地应力的影响。With the increase of excavation depth in open-pit mines, in-situ stress becomes an important factor affecting slope stability. Based on improved Spencer method, the formulas and program of three-dimensional LEM under horizontal geo-stress have been established and used in the slope of Shuichang open-pit mine. The numerical simulation results, using FLAC3 D based on strength reduction method and the in-situ monitoring data of the slope, have been used to compare with the results of LEM. Studies show that the factors of safety under horizontal geo-stress by LEM and numerical simulation method are smaller than that without geo-stress, but the slip masses are bigger. Displacements under horizontal geo-stress gotten by numerical simulation are closer to the values from field monitoring. Therefore, the impact of geo-stress must be considered for stability analysis on deep-concave slopes.

关 键 词：边坡稳定性 地应力 三维极限平衡方法 安全系数 数值模拟 

分 类 号：TD214[矿业工程—矿井建设]