The use of geosynthetics for the reinforcement and stabilisation of road structures: the case of the Lekié Loop rehabilitation project in Cameroon

Abstract

This work relates to the use of geosynthetics in the reinforcement and stabilization of pavement structures, through the case study of the rehabilitation project of the Lekié loop. The main objective is to assess the impact of integrating a geosynthetic layer in the subgrade on the mechanical behavior of the pavement, in terms of deformation, strength, and cost. The approach is based on a comparative analysis between a conventional pavement structure, corresponding to the initial contractual structure, and a structure reinforced with geosynthetics. The design of the contractual structure was conducted using Alizé-Lcpc, following the applicable technical recommendations. Subsequently, a three-dimensional modeling of the pavement was performed using Plaxis 3D 2024 to analyze the mechanical behavior of the two variants. The analysis of the mesh displacements, combined with the application of the laws of elasticity, made it possible to calculate an improvement coefficient of the base layer of 1.2, representing a 20% performance gain due to the addition of the geosynthetic. Furthermore, an economic analysis allowed for the assessment of the financial impact of this solution. It notes that despite an initial additional cost of 3.25%, the use of geosynthetics enables optimization of design, a reduction in maintenance costs, and a significant improvement in pavement durability. In conclusion, this study highlights the techno-economic benefits of geosynthetics for strengthening road infrastructures, particularly in sensitive environments. It opens up interesting prospects for the broader application of these solutions in the context of road projects.

Keywords: Geosynthetics; Pavement reinforcement; Numerical modeling; Alizé-LCPC; Tropical pavements.

Received Date: February 22, 2026

Accepted Date: March 14, 2026

Published Date: April 02, 2026

Available Online at: https://www.ijsrisjournal.com/index.php/ojsfiles/article/view/664