Abstract:For the influence of the permeability change of weak interlayer on the overall rainfall seepage characteristics of slope under the condition of wet and dry cycles, an generalized model was established by using Geostudio finite element software combined with the field practice to simulate the rainfall seepage under different times of wet and dry cycles, and the variation rule of pore water pressure under different times of wet and dry cycles was revealed. The results show that in the initial state, the pore water pressure of the soft interlayer and the lower limestone has little change because the weak permeable rain water of the soft interlayer is difficult to invade the soft interlayer and the lower limestone. As the permeability coefficient of the weak interlayer increases after the dry-wet cycle, it cannot be used as a water-insulating layer to prevent the downward intrusion of rainwater. With the increase of cycle times, the weak interlayer and the lower limestone are infiltrated by rainwater, and the pore water pressure increases. As the rainwater discharge capacity of the weak interlayer and limestone is much smaller than that of the upper area, the rainwater cannot be discharged in time. The area of high pore water pressure zone formed at the back edge of the slope body is much larger than the initial state, and the rain water has a greater impact on the overall stability of the slope. The research results can provide reference for slope protection in the same type of mine.