Geogrid Reinforced Soil Model Calibration Based on Laboratory Testing

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Geogrids are widely applied in infrastructure projects to enhance load-bearing capacity and mitigate soil settlement. Understanding the behaviour of soil reinforced with geogrids is crucial for optimizing design practices. This study investigates the mechanical properties of sand samples reinforced with geogrids through laboratory testing and numerical simulations. Triaxial compression tests were conducted for unreinforced and geogrid-reinforced sand samples with a variable confining pressures. The tests revealed an increase in cohesion (apparent cohesion) and minimal change in the angle of internal friction with geogrid reinforcement. Numerical simulations using the Hardening Soil model in PLAXIS 3D were performed to replicate laboratory tests, with adjustments made to improve alignment between numerical and experimental results. The numerical simulations demonstrated good agreement with laboratory-derived deviator peak values, with minor discrepancies observed at low cell pressures. Adjustments to the power index (m) and ultimate stiffness modulus (E_ur) were necessary to achieve better alignment, particularly regarding deformations at which the deviator peak occurred. The study concludes that the modelling approach is suitable for accurate triaxial compression tests simulations for soils reinforced with geogrids. The findings contribute to the advancement of geotechnical engineering practices, facilitating more accurate design and analysis of geogrid-reinforced structures.

28th European Young Geotechnical Engineers Conference (EYGEC2024)

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