The Effect of Soil Particle Size and Reinforcement Aperture Size on the Soil–Geogrid Interaction

Document Type : Research Paper

Authors

1 Department of Geotechnical Engineering, Faculty of Civil Engineering, Khaje Nasir Toosi University of Technology, Tehran, Iran

2 Department of Geotechnical Engineering, Faculty of Civil Engineering, Khaje Nasir al-Din Toosi University of Technology, Tehran, Iran

Abstract

In the current research, three coarse grained soils and four geo-grids of the same material but of different aperture size have been used. Experiments have been conducted using large direct shear box. Results have been employed to assess the effects of grain and aperture size on the shear strength of reinforced soils and comparing these results with the shear strength of unreinforced soils. The obtained results show that for a soil with a specific grain size distribution, there is a geo-grid with a specific aperture size which produces the maximum increase in shear strength. In addition, for each particular soil there is a specific aperture ratio that results in the highest shear strength. The maximum and the minimum interaction coefficients for all samples have been determined, which is an indication of the best and the worst soil–geogrid interaction.

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