三维边坡稳定性系数计算新方法及其工程应用

New Method for Calculating 3D Stability Factors of Slope and Its Application in Mining

应用有限差分程序FLAC3D,对露天矿边坡工程在分步开挖过程中表现出来的三维变形效应进行了研究,发现随着边坡开挖长度的不同,边坡向临空侧的最大位移呈现出显著的非线性变形响应特征,即在非线性变形曲线中出现一个重要特征点和由该点可以界定的两个差异明显的变形阶段;据此建立了变形体力学与刚体极限平衡分析的关系式,进而提出了三维边坡稳定性系数计算新方法,并成功应用于安太堡露天矿西端帮工程实践,在陡帮安全回采方面,取得了良好的技术经济效益和社会效益.

The 3D deformation effect of the surface mine slope engineering under step-by-step excavation was analyzed by using the software FLAC^3D. The results show that the maximum displacement against the slope presented remarkable nonlinear deformation response characteristic according to different excavated lengths of the slope, namely there is one characteristic point and two distinct successive phases divided by the characteristic point in the nonlinear deformation response curve. Based on this conclusion, the author established a relational expression between deformation mechanics and limiting equilibrium and put forward a new computational method to calculate stability factor of the 3D slope engineering. This new computational method was successfully applied to the west edge slope in Antaibao surface mine, obtaining a good technical, economic, and social benefit.