Abstract：Conventional triaxial experiments of two kinds of Fujian standard sands with different gradation were performed at different confining pressure. The effects of initial relative density on shear behaviors of sand were investigated. The experimental results indicate that the initial structure has a considerable effect on shear-strength of sand. At the same confining pressure, the initial tangent modulus and the peak deviator stress increase with the increasing of initial relative density. For the same relative density, the initial tangent modulus has a significant growth with the increasing of confining pressure, while the peak deviator stress increases gradually. The internal friction angle of the sample shows a linear growth with the increase of the initial relative density. Combined with the test results, the relationship of shear strength parameter and initial relative density was established to modify Mohr-Coulomb criterion with considering initial relative density.
2012, Vol. 33 
