Abstract
Sand is rarely found clean in natural deposits and it’s usually in composition of gravel, clay and silt. The purpose of this paper is to examine the effect of stress induced anisotropy (\(kc = \sigma^{\prime}_{1} /\sigma^{\prime}_{3} \ne 1\)) as one of the most important factors affecting the dynamic properties of natural mixed (with sand and silt) sandy soils. For this purpose, 77 dynamic triaxial tests is carried out on 10 cylindrical samples prepared from two mixed sandy materials, using large triaxial apparatus in isotropic and anisotropic conditions under different confining pressures and loading frequencies. The results showed that, for the studied materials, increase in anisotropy to \(kc = 2\) cause considerable increase in shear modulus, but shear modulus decreased for greater ratios. Also, shear modulus and damping ratio were dependent to confining pressure and loading frequency so that increase in loading frequency cause increase in shear modulus and damping ratio. Moreover, increase in confining pressure increased shear modulus but decreased damping ratio. The results were remarkably different from the available literature (performed studies on standard sands) at high frequencies.
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