期刊
ENGINEERING GEOLOGY
卷 191, 期 -, 页码 1-7出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.enggeo.2015.03.007
关键词
Thermal effect; Dynamic uniaxial compressive strength; X-ray Micro-CT; Damage; SHPB; Longyou sandstone
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC) [72031326]
- Innovative Research Groups of the National Natural Science Foundation of China (NSFC)
Temperature plays an important role in many rock engineering practices. The increase or decrease of temperature induces the damage characterized by cracks/voids in the rock and thus reduces its strength. Therefore it is essential to quantify the damage induced by the heat-treatment and establish its correlation to the mechanical properties of rocks. In this study, X-ray Micro-computed tomography (CT), a non-destructive observation technique was utilized to quantify the damage induced by the heat-treatment. Using CT images, the damage variables were measured for Longyou sandstone (IS) at three heat-treatment temperatures, 250 degrees C, 450 degrees C, and 600 degrees C, and room temperature of 25 degrees C. The dynamic compressive strength of LS was then obtained by a modified split Hopkinson pressure bar system with the loading rate from 10(2) to 10(4) GPa/s. An empirical equation to quantify the correlation between the damage variable and the dynamic compressive strength was established from the experimental data. (C) 2015 Elsevier B.V. All rights reserved.
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