Poisson's ratio values for rocks

Compared to other basic mechanical properties of rocks, Poisson's ratio is an elastic constant of which the significance is generally underrated. Yet, in rock mechanics, there is a considerable number of diverse areas which require a prior knowledge or estimation of the value of Poisson's ratio. This paper examines the values and applications of Poisson's ratio in rock mechanics. Following an historical account of the initial controversy, whether it was a material constant or not, the effects of Poisson's ratio in the elastic deformation of materials, intact rocks, and rock masses are briefly reviewed. Also, the reported values of Poisson's ratio for some elements, materials, and minerals are compiled while typical ranges of values are presented for some rocks and granular soils. Finally, Poisson's ratio classifications are recommended for isotropic intact rocks.