Abstract: With the continuous expansion of the scale of engineering construction and resource exploitation,the seismic safety and seismic reinforcement measures of various slopes have received increasing attention. Taking the viscous soil slopeanti-slide pile system as the research object,multiple sets of real seismic waves were selected,and a series of three-dimensional numerical analyses were carried out using the finite difference software FLAC 3D . The influence of factors such as the position, length and spacing of anti-slide piles on the deformation characteristics of the reinforced slope under strong earthquakes was systematically investigated,and a comparative analysis was conducted with the deformation law of the un-reinforced slope under seismic action. The research shows that anti-slide piles can significantly improve the seismic stability of slopes. The dynamic stability coefficient of the anti-slide pile reinforced slope obtained by the dynamic strength reduction method is 1. 43,which is about 6% higher than that of the un-reinforced slope. When the horizontal distance from the anti-slide pile to the slope shoulder is 0. 7 times the horizontal projection length of the slope surface,the acceleration amplification coefficient and the average permanent displacement of the reinforced slope surface are reduced most significantly compared to the un-reinforced slope,by approximately 8% and 10% respectively. This working condition has the best reinforcement effect. The pile length of 10 times the pile diameter is more appropriate. When the pile length is less than 6 times the pile diameter,the reinforcement effect is not obvious. When the pile length exceeds 10 times the pile diameter,the improvement in the reinforcement effect of the anti-slide pile is relatively small. As the pile spacing increases,the soil arching effect between piles weakens,and the reinforcement effect of the anti-slide piles gradually decreases. 

Key words: slope stability,earthquake,anti-slide pile,reinforcement mechanism,dynamic response,numerical simulation