The strength reduction method (SRM) is one of the main methods for evaluating slope stability and its key step is to select failure criteria reasonably and correctly. At present, non-convergence of numerical iteration, penetration of plastic zone, and the catastrophe of characteristic points displacement are usually used as slope failure criteria. To avoid the randomness of selecting characteristic points and the subjective error, this paper presents a new criterion: residual displacement increment criterion based on the displacement catastrophe criterion of characteristic points. In this criterion, the average residual displacement increment is calculated after each reduction, and the strength reduction factor corresponding to the maximum average residual displacement increment is regarded as the safety factor of the slope. This new criterion avoids the randomness of selecting characteristic points and the subjective error of judging the displacement mutation point artificially. The two-dimensional slope stability calculated by this criterion is compared with the other three criteria and Spencer method, which verifies the applicability and accuracy of this criterion.

强度折减法（SRM）是评估边坡稳定性的主要方法之一，其关键步骤是合理，正确地选择破坏准则。目前，数值迭代的不收敛性，塑性区的穿透性以及特征点位移的突变性通常被用作边坡破坏准则。为了避免特征点选择的随机性和主观误差，提出了一种新的判据：残差增量判据基于特征点的位移突变准则。在该标准中，在每次减小之后计算平均残余位移增量，并且将与最大平均残余位移增量相对应的强度减小因子视为斜坡的安全因子。该新标准避免了特征点选择的随机性和人工判断位移突变点的主观误差。将该准则计算的二维边坡稳定性与其他三个准则和Spencer方法进行了比较，验证了该准则的适用性和准确性。