Experimental and Numerical Study on Nano-Silica-Stabilized Clayey Subgrades with Geogrid Support

Nano-silica stabilization Geogrid reinforcement Clayey subgrade Pavement settlement Finite element analysis Sustainable infrastructure
["Dukuly, Lassana P","Ghani, Sufyan","Kushwaha, Sunayana"] 2025-06-01 期刊论文
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This study conducted an experimental and numerical investigation on the stabilization of clayey subgrades using nano-silica and geogrid reinforcement. Nano-silica was incorporated in varying contents (0-4%) to assess its effects on Atterberg limits, compaction behavior, shear strength, and California bearing ratio. The results showed optimal performance at 2.5% nano-silica, with reduced plasticity index and enhanced dry density, cohesion, friction angle, and bearing capacity. A three-dimensional finite element model was developed to simulate subgrade behavior under cyclic loading, incorporating the effects of both nano-silica and geogrid layers. The model was calibrated using laboratory data to reflect observed settlement and stress distribution. The numerical results confirmed that nano-silica reduced settlement significantly up to the optimal content, while geogrid reinforcement further enhanced load distribution and reduced displacement. The combination of nano-silica and geogrid resulted in improved mechanical performance of the subgrade. These findings demonstrate the effectiveness of integrating chemical stabilization and mechanical reinforcement in clayey soils to improve structural capacity and reduce long-term deformation, providing a viable solution for pavement subgrade enhancement.
来源平台:TRANSPORTATION INFRASTRUCTURE GEOTECHNOLOGY