A slope stability analysis method considering the rainfall hydrology process

Rainfall is one of the major factors inducing landslides. Stability analysis of the slope under the rainfall process is very important for disaster prevention and control. As a hybrid Lagrangian-Eulerian computational method, the material point method (MPM) is highly suitable for simulating the large deformation processes of geomaterials. By using a GPU-based MPM software (CoSim-MPM), a novel coupling method between the rainfall hydrology process and geomechanics is provided to analyze the influence of the rainfall on slope stability. The provided method considers both the influence of surface runoff and infiltration during the rainfall, and is able to simulate the whole process of water migration, deformation and failure of the slope. To perform the quantitative analysis of slope stability during the rainfall process, the strength reduction method (SRM) is introduced. And Qianling slope, Beijing, China, is taken as an application example, which was unstable during an intense rainfall in 2023. Based on the numerical results and field investigations, the mechanisms of slope deformation and failure under rainfall is analyzed. The results indicate that the provided method has robust advantages and efficiency in slope stability analysis during the rainfall, which can give an intuitive and comprehensive simulation of the entire process of slope deformation and failure.