滑动面的确定是斜坡稳定性评价中的一个关键问题。基于变分原理 ,以土质斜坡为例 ,介绍斜坡潜在最危险滑动面的计算模型及解析表达式。并可直接求出斜坡的临界滑动面和对应的安全系数 ,无需假设滑动面和对斜坡进行条分 ,尤其适用于滑动面未知的情况 The determination of sliding surface is a key issue in slope stability evaluation. Based on the variational principle, taking the soil slope as an example, the calculation model and analytic expression of the most dangerous slip surface in slope are introduced. And the critical slip surface of the slope and the corresponding safety factor can be directly calculated without the need to presume the sliding surface and strip the slope, especially for the case where the sliding surface is unknown