Mechanical and damage evolution characteristics of granite after heating-cooling cycles

Abstract

To explore the static mechanical and damage evolution characteristics of hot dry rock, groups of uniaxial compression test and Brazilian splitting test were performed on granite after cyclic heating-cooling treatment. Acoustic emission (AE) monitoring and scanning electron microscopy (SEM) techniques were utilized to analyze the AE characteristics and the micro-morphological characteristics of granite samples. The results show that the compressive strength has a significant linear relationship with the related tensile strength of the granite after different heating-cooling cycles. In both tests, the changes in AE counts basically agree with those in stress–strain curves. The normalized accumulated AE counts can well reflect the damage evolutions during complete loading of the granite. The initial damage to the granite increases with increasing temperature and number of heating-cooling cycles, resulting in a constant increase in the rate of damage to the granite. In addition, three damage variables were defined, of which the damage variable based on the tensile strength is the most sensitive to the number of heating-cooling cycles.

Keywords

uniaxial compression / Brazilian splitting / rock damage / acoustic emission / scanning electron microscopy / heating-cooling cycles

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