Abstract:

The Poisson’s ratio of soil is a significant parameter which reflects the characteristics of soil lateral deformation. The importance of this mechanical property has not been appreciated as much as it deserves. The variation of Poisson’s ratio is obtained through triaxial test based on local deformation measurement of soil specimen. Because the arrangement and combination structure of material particles are analogous under the same testing method and density, the variation of deformation law of specimen under different cell pressures is similar. The tangent Poisson’s ratio of soil increases when the principal stress ratio increases. It is reasonable to establish the relationship between the Poisson’s ratio and principal stress ratio.

Key words: Poisson’s ratio, triaxial test, principal stress ratio, sandy soil