Abstract: Soil-cement pile is a common cost-effective reinforced structure used in soft soil slope. However, its deformation, failure, and mechanism of anti-sliding to improve the slope still remain unclear. Currently, relevant researches on stability analysis are relatively limited. A slope model was established by finite element method to analyze the deformation and failure characteristics of reinforced discrete cement-soil pile. The results show that, when failure occurs, the deformation incompatibility between the pile and soil would cause plastic sliding. The soil-cement pile with large stiffness and strength deflects into S-shape, leading to a bending failure of soil-cement pile. It indicates that the soil-cement pile fails to develop the slide-resistant ability as design required. Finally, a shear slip band, instead of a slip surface, passed through the stabilized slope. A concept about soil-cement shear wall has been proposed. By the finite element simulation, the sliding force was found between the shear wall and slide mass due to the effect of interface friction when the soil-cement shear wall was used to stabilize the slope. The general shear failure would occur in the stabilized slope, meaning that the shear wall has effectively mobilized its slide-resistant capacity. At last, a lateral shear model test on the pile-soil composite structure has been carried out to verify the results of the numerical simulation.

Key words: soil-cement pile, soil-cement shear wall, safety factor, strength reduction method, model test