Abstract
The concept of pure damage or the nucleation and evolution of voids is the primary phenomenon responsible for rock failure. However, the behavior of rocks under HPHT is very different than under the conditions of normal pressure and normal temperature. HPHT conditions occur at depths of around 3,000 m or below. A rock, which is otherwise a brittle material, behaves more like a metal showing ductile behavior under HPHT conditions. Due to confinement, the fragments can stay together and flow like a continuum thus demonstrating ductile behavior. In this study, a ductile damage model was developed to examine the behavior of rocks under these special conditions. The model includes two coupled theories; the elasto-plasticity theory and the damage evolution theory. Two main problems that were studied are: the un-constrained uniaxial compression and the completely constrained uniaxial problem. The results focus on the effect of confining pressure on rock failure.
Published Version
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