Centrifuge Model Test of Soft Soil for Pile-Net Composite Foundation with Overlying Sloping Base Reinforced by Inclined Piles

Abstract:

Two geotechnical centrifuge model tests with a similar ratio of 1:100 were performed to investigate the reinforcement effect of inclined piles for the existing pile-net composite foundation on soft soil overlying sloping base. The test results show that due to the reinforcement of inclined piles, the post construction displacement (vertical and horizontal) on the top of the embankment is reduced effectively and the development of the settlement difference on both sides of the embankment top can also be controlled. Meanwhile, reinforced by the inclined piles, the horizontal and vertical displacement of the pile top of the slope pile and friction pile in the existing composite foundation can be restrained effectively, and the damage of the geogrid and the generation and development of the asymmetrical “basin” settlement of the composite foundation can be prevented. In addition, the horizontal thrust in the existing composite foundation can be reduced and the stiffness and stability of the foundation can be improved significantly by inclined pile reinforcement. The research shows that the inclined pile is an effective measure to reinforce the existing pile-net composite foundation on soft soil overlying sloping base.

Key words:inclined piles;overlying sloping base;soft soil;pile-net composite foundation;geotechnical centrifuge model test