Stability of cracked expansive soil slopes subjected to rainfall infiltration is closely related to seepage distribution. The impact of accumulated water depth on seepage is numerically analyzed. The results show that the impact of accumulated water depth on seepage distribution is very small and the assumption that accumulated water depth is zero can be accepted in seepage analysis. Based on different dimension of cracks and their different permeability of expansive soils

a new method of seepage analysis subjected to rainfall infiltration considering cracks system is presented

which shows that cracking behavior not only has a great effect on seepage distribution

but also much better simulates seepage distribution change with time than before. And the results obtained from engineering cases can reasonably explain the mechanics of shallow landslide of expansive soil slopes.