Stability of embankment slope subjected to rainfall infiltration considering both runoff-underground seepage and fluid-solid coupling

Based on the effective stress theory of a single variable of unsaturated soil, unsaturated water-gas fluid-solid coupling equations are established. The railway K240+10-70 from Dazhou to Chengdu, Sichuan, is damaged caused by rainfall considering runoff-underground seepage and fluid-solid coupling, with numerical simulation of engineering examlpe of the slope. The corresponding characteristics of the numerical simulation damage and the examlpe are exactly the same, which prove that the numerical simulation is feasible, and what's more, with numerical simulations, effects of kinds of factors on slope stability subjected to rainfall are analyzed with its scope and depth of damage and infiltration depth of rainfall, from which it can be concluded that the intensity of rainfall and duration and long-term strength have more effects on slope stability subjected to rainfall.