Constitutive Equations of Rock with Shear Dilatancy
Final technical rept.
GEORGE WASHINGTON UNIV WASHINGTON DC INST FOR THE STUDY OF FATIGUE FRACTURE AND STRUCTURAL RELIABILITY
Pagination or Media Count:
Coupling between dilatation and shear stress referred to as dilatancy, has been shown to be a significant feature of rocks. Dilatancy has been identified by Lord Kelvin 1875 and by Reiner 1947 as a second-order effect in the isotropic continuum that arises from the application of the principle of material indifference. Relations required for the interpretation of tests results in the light of this theory are derived. It is shown that dilatancy in rocks is not the result of cracking at compressive stresses below the limit of shear failure, but its cause. Shear-induced density-gradients of physically significant magnitude are believed to provide the key to the understanding of important aspects of the behavior of rocks and rock-like solids.
- Geology, Geochemistry and Mineralogy