Abstract Infiltration into soil slopes is a fundamental concern in civil engineering. Rainfall infiltration leads to changes pore-water pressure and reduces matric suction soils, making it one of the main triggers slope failure (Ali et al. Comput Geotech 61:341–354, 2014; Wu Hydro-mechanical analysis rainfall-induced landslides. Springer, 2020). Slope instabilities caused by water are called la...