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Triaxial compressive behavior of rock with mesoscopic heterogenous behavior: Strain energy density factor approach
Authors:XP Zhou  
Institution:School of Civil Engineering, Chongqing University, Chongqing 400045, PR China
Abstract:The strain energy density factor approach is used in conjunction with a micromechanics model to investigate the condition and direction of shear failure for brittle rock subjected to triaxial compression. Moderate confinement in addition to localized deformation and damage are considered. Quantified are the effects of the various geometric and load parameters that involve the interaction of microcrack, friction and the confining pressure such that the path of the wing crack is taken into account. The influence of all microcracks with different orientations are introduced into the constitutive relation. The closed-form solution for the complete stress–strain relation of rock containing microcracks is obtained. It is shown that the complete stress–strain relationship includes linear, nonlinear hardening, rapid stress drop and strain softening effects. The theoretical results show that deviation of the direction of wing cracks from the line of the pre-existing crack decreases with increasing confinement pressure and friction coefficient. Theoretical predictions and experimental results show good agreement.
Keywords:Triaxial compression  Moderate confinement  Strain energy density factor approach  Mesoscopic heterogenous of brittle rock  Deformation and damage localization  Stress–  strain relation  Shear failure
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