Reliability analysis of rainfall infiltration slopes considering spatial variability of material parameters

The material parameters of soils have spatial variability. The covariance matrix decomposition method is used to discretize the random field to simulate the spatial variability of the soil, and the analysis of the influence of the spatial variability of the material parameters on the reliability of the slope helps to accurately judge the stability of the slope. Based on the strength reduction method and Monte Carlo method, the safety coefficient of each random field is determined and the reliability index of rainfall infiltration slope considering spatial variability is calculated. The results show that after considering the spatial variability of shear strength parameters, the slope reliability index becomes smaller and gradually decreases with the increase of soil correlation; compared with the horizontal correlation distance, the change of vertical correlation distance has a more obvious effect on the rainfall slope reliability index; the slope reliability index decreases with the increase of the coefficient of variation of shear strength parameters, and the effect of the coefficient of variation of internal friction angle is greater.