本文基于摩尔——库仑破坏准则建立了一套边坡计算的三维极限平衡条柱法,并用这套方法以自编的Fortran程序对长直边坡进行了计算、分析,得到如下主要结论:三维法的计算安全系数随滑体长度增加呈对数函数下降。三维法的安全系数较二维法高的原因有两点:一是三维滑面效应;二是边坡中侧向压力的作用。当边坡体的内聚力很小时,三维效应很小。 In this paper, a three-dimensional limit equilibrium bar method for slope calculation is established based on the Moore-Coulomb failure criterion, and this method is used to calculate and analyze the long straight slope with the self-made Fortran program. The main conclusions are as follows: The calculated safety factor of the method decreases logarithmically as the length of the slide increases. There are two reasons why the three-dimensional safety factor is higher than the two-dimension method: one is the three-dimensional sliding surface effect; the other is the effect of lateral pressure in the slope. When the cohesion of the slope body is small, the three-dimensional effect is small.