Study of stability of large landslide considering fluid solid coupling

China is a country with frequent landslide disasters, especially in Western China. Chongqing Wulong County Yangjiao landslide is taken as the engineering background. Three-dimensional elastic constitutive model is used to calculate the soil aggregate landslide’s overall stability and landslide stability analysis of deformation and failure process disintegration. Combined with engineering practice of gravel soils under the action of rainfall of the landslide collapse deformation failure process analysis, the main failure mechanism of landslide deformation is revealed under the action of rainfall. Combined with the geographical position of the landslide and the effects of the earthquake, the coupling model of the earthquake and rainfall is established. The stability of the landslide in the earthquake and strong rainfall is analyzed. The results show that the landslide deformation and failure are affected more significantly by the slope morphology, and the landslide has a significant amplification effect of seismic waves.