Abstract: Under soft silty clay deposits, traditional sandbag embankments struggle to meet engineering durability and safety requirements. Geogrids, leveraging their exceptional tensile properties, demonstrate significant advantages in soft soil stabilization and present a novel reinforcement approach for sandbag embankments. However, the settlement deformation mechanisms of geogrid-reinforced sandbag embankments under soft soil conditions remain inadequately understood. This study conducted a series of laboratory-scale model tests to investigate the reinforcement benefits of geogrid in sandbag embankments. A numerical model was then developed using PLAXIS software and validated against the experimental results to ensure its accuracy. Subsequently, a parametric analysis was carried out by varying geogrid stiffness, sandbag thickness, embankment slope, and embankment base width. The obtained results indicate that foundation settlement increases with embankment height, sandbag thickness, and embankment slope but decreases with the increase of geogrid stiffness, accompanied by a reduction in geogrid tensile force. Broadening the embankment base transforms foundation surface settlement profiles from parabolic to basin-shaped distributions, accompanied by a shift in geogrid tensile stress patterns from parabolic to saddle-shaped configurations. It is recommended that the geogrid stiffness in engineering applications should not be less than 600 kN/m, with a maximum embankment slope of 1:2, to effectively mitigate foundation settlement and enhance the long-term stability of geogrid-reinforced sandbag embankments. These findings provide valuable theoretical guidance for the design and construction of geogrid-reinforced sandbag embankments.