Determination of Poisson’s Ratio of Rock Material by Changing Axial Stress and Unloading Lateral Stress Test

Excerpt

Poisson’s ratio is defined as the negative value of the ratio of the radial strain and the corresponding axial strain, caused by uniformly distributed axial stress, within the scope of the material’s proportional limits. It reflects the lateral deformation of the material, and is widely used in elastic theory. Previous studies have shown that the upper and lower limits of Poisson’s ratio are 0.5 and −1, respectively, and Poisson’s ratio for the vast majority of materials is 1/3 (Lakes 1987; Shan et al. 2006). In the field of numerical analysis of geotechnical engineering and engineering design, Poisson’s ratio is an important parameter reflecting the lateral deformation of the rock and soil mass and it directly affects the strength and deformation characteristics of the rock and soil mass. …