Abstract: By constructing two-layer slope models and experiments under artificial rainfall, the water content and the pore water pressure in the nonhomogeneous slope are monitored continuously to obtain their rules of variation. The variations of monitored parameters of the two-layer slope are obtained as follows: (1) The water content and pore water pressure of the heterogeneous slope are not only related with the depth but also the physical properties of soils under steady seepage, which is significantly different from that of homogeneous slope. (2) The response time of the water content and pore water pressure increases with the slope depth. After the rain the water content and the pore water pressure of lower layer decreases more rapidly than that of the upper layer. (3) Under the same rainfall intensity, the water content and the pore water pressure  develop with the duration of rainfall. The response time is earlier if the rainfall intensity is higher, but the time effect is not significant nearby the slope surface. (4) If the slope seepage achieves a steady state during rainfall, the prophase rainfall mainly influences the water content and pore water pressure in the rainfall process. The research serves as a basis for the stability analysis of heterogeneous unsaturated soil slope in infiltration condition. 

Key words: artificial rainfall, two-layer soil slope model, seepage, water content