The main purpose of this study is to investigate the influence of particle shape and density index on shear strength parameters of Transylvanian sands and to provide accurate information for better understanding of sands behavior. The paper contains two parts. First part refers to the study of physical parameters in terms of density index, particle size distribution and particle shape and provides an analysis of particle shape influence on density index of the sands. The second part of the paper refers to the study of the influence of particle shape and density index on shear strength parameters of Transylvanian sands. Drained triaxial tests were performed on each type of sand at three different densities and both effective and critical values of shear strength parameters were determined.
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