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Abstract An anisotropic damage model and an effective thermal conductivity model were presented based on homogenization techniques for low-porosity brittle rocks subjected to mechanical and thermal loadings. The thermal effect，the recovery of normal stiffness and the mobilized dilatancy behavior were incorporated in the damage model. The thermal conductivity model took into account the effects of damage-induced microstructure evolution，crack shape，porosity and saturation degree on the effective thermal conductivity of brittle rocks. The influences of crack shape and saturation degree on the effective thermal conductivity of low-porosity crystallized rocks were particularly discussed. The damage model was validated by the triaxial test data on an intact Äspö diorite；and the evolutions of porosity，crack density，crack shape，saturation degree and the effective thermal conductivity during the mechanical loading were demonstrated. The results may provide a helpful reference for better understanding the coupled thermo-mechanical behaviors of deep rocks.
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Received: 11 April 2011
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2011, Vol. 30 
