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Rainfall infiltration presents a significant hazard to slope stability in various global regions. While most previous researches focus on the variations in the factor of slope safety under rainfall infiltration, there is a notable lack of attention to post-failure behaviors of slopes, e.g., the large deformation of slopes triggered by rainfall is often ignored. This is due to the traditional slope stability analysis methods, such as the limit equilibrium method (LEM) and finite element method (FEM), struggle with modeling large deformation of soils. Moreover, the impact of rainfall patterns on the post-failure behaviors of rainfall slopes remains unexplored. To address these issues, this study proposes a new effective coupled method to quantify the postfailure behaviors of landslides affected by different rainfall patterns, employing a combination of FEM and the Generalized Interpolation Material Point (GIMP) method. The results show that the slope failure times for different rainfall patterns are 14 h (uniform), 14 h (advanced), 4 h (delayed), 9 h (intermediate), and 11 h (intermittent), with corresponding runout distances of 2.76 m, 2.95 m, 2.06 m, 2.31 m, and 2.55 m, respectively. Analyzing the large deformation analysis of rainfall-induced landslides can offer new insights to quantitatively identify post-failure features of such disasters.
Liu et al. (Thu,) studied this question.