Volume 23, Issue 3 (September 2000)
An Investigation of the Elastic Stress-Strain Behavior of a Banded Sandstone and a Sandstone-Like Material
A complete methodology has been presented and implemented that enables the independent determination of the five mechanical parameters required to describe the elastic behavior of a transverse isotropic rock. The uniqueness of the methodology is that only one specimen is required. A single hollow specimen is subjected to a series of specific stress conditions. From each stress condition a different parameter or parameters may be determined. The most important advantage of the methodology is that the difficulty of material variability between specimens is to a large extent eliminated. Testing of multiple specimens allows for a better formulation of the nature of the material isotropy and the variability in material parameters.
Results of the methodology compare favorably to other more conventional frameworks such as uniaxial testing and Brazilian compression. The bulk of the testing was carried out on a natural anisotropic banded sandstone; however, a set of control specimens of sand concrete were tested in order to consider the credibility of the methodology.
The methodology has been implemented to consider possible differences in the response of both materials to compressive and tensile stress regimes. Over the range of stresses considered, the differences between the compressive and tensile stiffnesses are surprisingly small.