In this paper the effects of physical properties of Quaternary deposits on the strength parameters of soil are studied in north of Esfahan. The soil samples are classified as GM according to the Unified Soil Classification System. The samples were well graded with dry density ranges between 1.77 and 1.95 g/cm 3 and moisture content ranges between 5.2% and 10.9%. The scope of the experimental program reported in this paper was to perform plate load test on alluvial fan deposits with different density and moisture content. Variations in modulus of a soil (modulus of subgrade reaction, Ks and modulus of elasticity, Es) and strength parameters (friction angle and cohesion) were determined at different experimental levels of physical parameters (dry density and moisture content). Results showed that all parameters of soil strength and modulus in-creased with increased dry density. In contrast these parameters decrease with increased moisture content.

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