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中文摘要：
通过用2D／3D有限差分强度折减法计算，揭示了二维和三维稳定性系数（F2／F3）同弱层角度、厚度的变化规律，并分析2D／3D变化规律形成的内在机制。计算结果表明，F2／F3和最大位移不同的根本原因是边坡滑体存在三维端部效应，滑体两侧的边坡体有侧向约束作用；对于这种顺倾弱层边坡，应用2D／3D分析相结合的方法进行研究是一种较为恰当的选择。
英文摘要：
In this paper , by using 2D / 3D finite difference strength subtraction calculation, the 2D and 3D stability factory （ F2/F3 ） variation rule is revealed with the angle, thickness of the weak layer, and analysis of the internal mechanism of 2D/3D form of variation. The calculation results show that the basic reason of the difference of F2/F3 and the maximum displacement is that there is a three dimensional end effect in the slope slide ,which landslide on both sides of the slope body have lateral restraints. For along the dip weak layer of slope with 2D / 3D analysis method of combining research is a more appropriate choice.
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