Influence of Dilatancy of Rock on Stress-Wave Propagation According to Classical Plasticity Theory

摘要

The effect of dilatancy of rocks on computed stress-strain states for the one-dimensional strain condition of stress wave propagation has been examined. Calculations were made using three different constitutive relations of progressively greater complexity and assuming the applicability of classical plasticity theory. If rock deformation in uniaxial strain can be realistically described by classical plasticity theory, comparison of stress-strain curves with and without dilatancy, but with the pressure effect on strength included, shows that it has minor influence on stress wave loading. In contrast, dilatancy effects during unloading can be quite important because of their influence on the residual stress state of the rock. This conclusion depends, however, on whether or not rocks actually inelastically dilate during unloading, an aspect of deformation which needs to be verified experimentally. (ERA citation 08:001095)