Sandy soil reinforced with denti-inclusions is a new concept of reinforced soil. In the grid with denti-inclusions

besides the conventional latticed inclusions

vertical reinforced elements are also placed in the soil. The behavior of interface between soil and geosynthetics is a significant factor for analysis and design of reinforced earth structures which is simplified as pullout performance. This paper presents the results of pullout tests and numerical simulation aimed at studying the interaction mechanism of reinforced sand. The pullout test is carried out to study the macroscopic mechanism. PFC is adopted to simulate pullout tests and the interface between geosynthetics and sand with emphasis on the meso-analysis. On such a basis

the model of PFC is established by using parallel-bond model to simulate the reinforcement. The sand particle movement trajectory and the particle contact orientations are studied. The results show that the shear bond is influenced by the denti-inclusions and the stress concentration occurs nearby the denti-inclusions. The intrinsic factors which form and change the mechanism of the interface properties are the “cohesion” provided by friction

occlusive force and passive resistances. The study results can provide a new understanding for future studies on the mechanism of the reinforced interface.