ABSTRACT
Determining the shear strength parameters of the conditioned soils usually lead to the use of conventional shear box tests because of no availability to large shear boxes. In order to use this apparatus, soil gradation must be modified based on the codes which demands to elimination of great mass of coarse particles. This elimination affects the shear strength parameters especially in conditioned soil. In this research the effects of sample dimension and soil gradation on properties of foam conditioned soils have been investigated.A modification on soil gradation has been done in samples of large and conventional shear boxes. The variables in this research are normal stress and the injected foam quantity in to each of soils.
