Shear strength is a crucial parameter in geotechnical engineering, influencing the stability of foundations, slopes,
and other structures. This research work explores the relationship between shear strength and relative density of sands
prevalent in middle Gujarat, India. We collected sand samples from various locations across the region viz., Khanpur,
Sevaliya and Ahmedabad. Unconsolidated-Undrained direct shear tests in the laboratory were performed on these samples
under controlled conditions to determine their shear strength at different relative densities of 30%, 50%, 65%, and 75%. To
understand the effect of gradation, collected samples were mixed in different proportions to get three different well graded
samples and the same study was carried out. The results are analyzed to establish a correlation between these two critical
soil properties. Strength properties of soil in dry as well as wet condition is also studied to understand effect of drainage on
soil strength.
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