ABSTRACT
In this paper, a series of laboratory tests were carried out through large direct shear apparatus, and the variation law of shear strength with different geogrid reinforcement angles was analysed. Using discrete element simulation, the influence of different placement angles on the meso-characteristics of geogrid reinforced soil is analysed from the perspectives of force chain evolution, geogrid deformation, shear band and particle displacement. The results show that when geogrid is placed at 60°, the shear strength is the highest and the tensile performance is fully exerted, which effectively prevents the displacement of soil. The force chain is concentrated and passes through the middle of the geogrid. The movement of soil particles in the lower box leads to the compression of the longitudinal ribs of geogrid placed at 120°, which fails to prevent the movement of soil particles, and the force chains are scattered due to the compression of soil.
