INFLUENCE OF PARTICLE SIZE GRADATION AND RELATIVE DENSITY ON SHEAR PARAMETERS FOR COHESIONLESS SOIL

Geotechnical Engineering

The wide range of particle shapes and size distribution of sand, by virtue of its sedimentological process of formation plays a significant role in engineering behaviour when used as fill material or foundation material. The relative density of a granular cohesionless soil indicates its degree of compaction. Shear strength parameters increases as we go from lower to higher relative density. The research work includes a series of direct shear tests for performed on granular soils consisting of sand with different particle gradations (i.e. C-M,C-M-F,M-F) and different relative densities (i.e. 30%, 45%, 60%, 75%, 90%) reconstituted in laboratory. Direct shear testing was performed on all gradations for different relative density to determine the angle of internal friction under normal stresses of 50 kN/m2, 100 kN/m2, 150 kN/m2, and 200kN/m2. The direct shear testing showed that as the particle size within the sample increased, the angle of internal friction also increased.

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