Geosynthetic Reinforcement: A Strategy for Preventing Deformation of Flexible Pavements on Unstable Ground

Abstract

This study assesses the effectiveness of geosynthetic reinforcement for flexible pavements on unstable ground. The methodology includes geotechnical data collection and modelling with Alizé LCPC and PLAXIS 2D 8.2. The results highlight the importance of geogrid reinforcement. Vertical deformations are reduced by the geogrids, with values of 3.44. m (phase 0 unreinforced), 2.65. m (phase 1 reinforced) and 2.07. m (phase 2 reinforced with reduced thickness). Horizontal deformations show an improvement of 117.07. % (reinforced pavement) compared with 51.54. % (reduced thickness). Vertical deformations showed a significant reduction, with 141.84. % (reinforced pavement with thickness reduction) compared with 171.32. % (reinforced pavement). In summary, geogrid reinforcement in flexible pavements offers an effective reduction in deformation. Combined with optimisation of the subgrade thickness, this strategy improves stability, strength and bearing capacity. This approach can be extrapolated to other road contexts for a better understanding of its benefits. Keywords: Geogrids, Deformations, Flexible pavements, Unstable soils