Numerical Simulations on Three Rows of Stepped Anti-Slide Piles Against Filling Slopes on Hillsides

In view of a new type of anti-slide retaining structure-three rows of stepped anti-sliding piles,based on a certain actual filling slope,the mechanical characteristics, supporting effects, and influence of geotechnical parameters on mechanical characteristics of three rows of stepped anti-slide piles were discussed by the finite difference software FLAC3D. The analysis results indicated that the members of stepped anti-slide piles were of the collaborative work, coordinated deformation, large lateral stiffness,strong resistance to lateral deformation and convenient construction during filling of slopes, which could better constrain the deformation of slopes. the tensile stress concentration was easy to occur at connections between piles and beams; the tension in the back of rear piles was largest and took the second place in intermediate piles, the tension in the front pile was smallest. The lower beam was prone to shear stress concentration, and the lower beam was sheared stronger than the upper beam; as the internal friction angle of the backfill decreased, the internal forces in each member of the anti-slide piles increased,and the growth rates were increasing. With the increase of the internal friction angle of fillers, the deformation of anti-slide piles gradually decreased, and the growth rates were decreasing.