Anti-slide pile is widely used in landslide improvement in the Three Gorges Reservoir area. How about the effectiveness of the anti-slide piles construction and if it can ensure the landslide stability under the long period reservoir level fluctuation

which is one of the important subjects to be studied urgently. Taking Baishuigou landslide

which is the sub-landslide of Tianjiaping paleo-landslide located in the new Badong County

as a example

based on the engineering geological investigation results and anti-slide pile design data

the 2D finile element model was developed and the rational calculation parameters of the rock and soil and pile were chosen. According to the simulation scheme

with ANSYS software

with pile and without pile

the landslide stability under water level fluctuation

considering gravity only and gravity and strom

was simulated and analyzed separately. Based on them

we analyzed the effects of nti-slide pile under water level fluctuation and storm. The results show that: ① the deformation and failure mechanism of Baishuigou landslide is a pull-type. The landslide stability under storm and water level drawdown from 175m to 145m decreases; during the period water level fluctuation

the landslide stability gradually decrease further to failure. ② the piles

designed under water level drawdown considering the storm

is effective under storm and water level drawdown form 175m to 145m; ③ after a long term period water leverl fluctuation

the deformation has apparently gradually further incrtease; the landslide stability decrease further. Even though the anti-slide pile has anti-slide effectiveness

the anti-slide effectiveness is gradually decrease. Hence

we should consider the effect of the period water level fluctuation when we design antl-slide pile.