During the trial operation of the Three Gorges Project

there are remarkable differences between the deformation of landslides due to different geological conditions and permeabilities. Therefore

besides the geological structure

more attention should be paid to study the regularity of stability variation of different permeability landslides under the condition of reservoir level change. Taking the Huangjingshu landslide at the head area of the Three Gorges as the computation model

the seepage field of 4 landslides with different permeabilities are studied as the water level changes at a steady speed from 0.5 m/d to 2.0 m/d. As the evaluation index

reservoir water influence coefficient

the ratio of water level change speed to permeability coefficient

and stability change ratio is proposed. And the regularity of stability variation is obtained under the condition of permeability and water level change. The results show that when the reservoir water influence coefficient ? changes from -0.107 to -0.322

the stability change ratio ? is the largest; and the ? decreases as ? reduces. When ? changes from-0.644 to -769.231

the ? almost unchanged as ? decreased. When ? changes from 576.923 to 769.231

the reservoir filling had less effect on the landslide stability. When α changes from 0.107 to 384.615

the correlation of ? and ? is not obvious. It has some values for the landslide monitoring and warning in the Three Gorges reservoir area