Abstract:A new three-dimensional slope stability analysis method is developed based on 2D Janbu¢s generalized procedure of slices,in which all forces acting on the discretized columns are considered and static equilibrium in three directions is satisfied. In this method,the potential sliding mass is divided into rigid columns. Each column is separately analyzed by using two types of relations,geometric relations and force and moment equilibrium formulations. By introducing force boundary conditions,the stability problem is determined statically. This method may be applied to various types of potential sliding surfaces with complicated geological boundaries and stratifications,water pressure and earthquake loading. Also the method extends traditional limit-equilibrium method that only gives one value of the safety factor for an integrated slope,and the safety factor and sliding direction for each column are analyzed according to the characteristics of its sliding surface. With this method,the potential sliding direction of each column can be obtained. As an extension of 2D Janbu¢s method,this method also has the advantages and disadvantages of 2D Janbu¢s method. Moreover,The results calculated by the method for a slope in Yunyang,Chongqing,China,are given in detail,such as the safety factors and sliding directions of columns. The results obtained by 2D Janbu¢s method for a longitudinal section of the slope are presented also for comparison.