This paper presents a numerical investigation of the performance of the geosynthetic reinforced soil abutments in terms of lateral facing deformation and maximum strain distribution along geosynthetics under service loading conditions. Simulations were conducted using two-dimensional (2D) PLAXIS 2016 Finite Element (FE) program. The hardening soil model proposed by Schanz et al. (1999) was used to simulate the behavior of the backfill material; the interface between the backfill materials and the reinforcement was simulated using the Mohr-Coulomb frictional model, and the reinforcement and facing block were simulated using the linear elastic model. The numerical model was first verified using the results of field case study conducted at the GRS-IBS of Maree Michel Bridge, Louisiana. A parametric study was then carried out to investigate the effects of internal friction angle, setback distance, strip footing width, and bearing bed reinforcement (secondary reinforcement) on the performance of the GRS-IBS. The results of the FE analyses indicate that the internal friction angle of the backfill materials has a significant impact on the maximum strain distribution along the geosynthetic and the lateral facing displacement. It was noted that the setback distance and the strip footing width have a low impact on the performance of GRS-IBS in terms of maximum strain along the geosynthetic and lateral facing deformation. The results also indicate that the bearing bed has no influence on the lateral facing deformation. It was also noted that the maximum strain along the reinforcement at 20, 40, and 60% of the abutment height as measured from the bottom of the abutment decreases slightly when bearing bed reinforcement is included. However; the maximum strain is significantly affected along the reinforcement at 80% of the abutment height as measured from the bottom of the abutment.