Influence of thermal damage on uniaxial compressive strength and elastic modulus of different rock types

Abstract High temperature has a large influence on mechanical behavior of rocks. Results from previous laboratory tests show that the variation of mechanical parameter with treatment temperature is different for various rocks. However, the mechanism of difference in variation of mechanical parameter with treatment temperature for different rock types is not deeply discussed. This paper studies the variation of uniaxial compressive strength (UCS) and elastic modulus with treatment temperature for different rock types, with a focus on elucidation of its underlying mechanism. A large amount of test data from previous studies is first collected. The collected test data includes 13 sets of granite, 12 sets of sandstone, and 9 sets of marble. The results of UCS and elastic modulus for different rocks are then comprehensively examined. The variation UCS and elastic modulus with treatment temperature is classified into three categories. At last, the underlying mechanism of difference in variation of UCS and elastic modulus with treatment temperature for different rock types is comprehensively discussed. The results in this study provide useful guidance for determining the variation of mechanical parameter with thermal damage for different rock types.