边坡稳定性的三维极限平衡分析方法及应用

边坡稳定性评价，特别是对于具有复杂几何特征的问题，应作为三维问题来处理。文中提出了一种评价边坡稳定性的三维极限平衡方法。该方法中滑面可采用４ 种类型：天然不连续面，剪切作用形成的球面，剪切作用形成的旋转椭球面和组合面。程序使用者可结合工程经验方便地确定可能的滑面，对工程上可能的多个滑动方向进行计算。同时可考虑地下水作用、地震等因素。水库库岸滑坡区分析算例表明，该方法及ＳＳＡ ３Ｄ 程序适合处理三维边坡稳定性评价问题。

3D limit equilibrium method for slope stability and its application

In this paper a three dimensional limit equilibrium method is presented for stability assessment of the slope with distinct spatial features. Four types of sliding surfaces can be used in this method, namely, the known discontinuity, sphere, rotational ellipsoid, and composite surface. The user of the program can easily select the possible sliding surface with the help of his experience. Calculation can be conducted on a series of sliding directions possible from the engineering viewpoint. Seepage and seismic forces and other factors are considered. An example of analysis of a reservoir bank slope displays that the proposed method is suitable for 3D treatment.