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In order to evaluate the shear strength and dilatancy behavior of coarse granular soils reinforced with geogrid a large direct shear apparatus (1000×1000×940 mm) was built. A series of shear tests were carried out to study the effect of geogrid orientation and soil volume changes on shear strength. A numerical model is proposed to calculate the shear strength increase. This is verified by the experimental results. Tensile strains in the geogrid can also be calculated using this model.
Direct shear test, reinforced soil, shear strength, soil dilatancy, geogrid, tensile strain
Professor, Center for Geosynthetics Research Information and Development (C-GRID)Carleton University, Ottawa,
Ph. D. Student, Carleton University, Ottawa,