Abstract: Numerous wading landslides formed after dams were completed. In order to study the impact of the wading landslide’s stability induced by water level fluctuation. Based on the classification of significant wading landslide, in light of landslide of buoyancy weight loss, applying the self-made landslide model test system, and establishing the landslide model of buoyancy weight loss, the reservoir water level fluctuation test is carried out. The test results indicate that the effective stresses of the landslide model decrease with the reservoir water level increasing and increase with the water level lowering. For the model test, Geo-studio software is used to model the process of seepage and calculate the stability. By comparing the results of experiment and numerical simulation, it is shown that the changes of seepage simulation of earth and pore water pressure are basically consistent with changes of test results. The stability coefficient decreases with the reservoir water level increasing and rise with the water level lowering. The law of reservoir water level fluctuation on the buoyancy weight loss landslide stability is drawn as follows; that effective stresses of the landslide decrease with the reservoir water level increasing, resulting in lower landslide stability; effective stresses of the landslide increase with the reservoir water level lowering, so as to make the landslide stability increase.

Key words: reservoir water level fluctuation, effective stress, groundwater table, coefficient of stability, numerical simulation