科研之友
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摘要
Using a hydraulic servo pressure testing machine, we investigated physical and mechanical properties of granite and sandstone samples after high-temperature treatment. Variations in apparent form, density, longitudinal wave velocity, damage, stress-strain curve, compression strength, peak strain, and elastic modulus with temperature are analyzed. We explored the differences in temperature effects on the physical and mechanical characteristics. Granite samples begin to gradually change from taupe to gray above 600 degrees C and sandstone samples start to gradually change from gray to brownish-red above 400 degrees C. 600 degrees C and 800 degrees C are respectively the brittle-ductile transition critical temperatures of granite and sandstone stress-strain curves. Rock density generally shows a gradual decreasing trend with temperature increasing. The influence of high temperature on sandstone density is much greater than granite. The decline rate of longitudinal wave velocity in granite is much greater than sandstone. Overall, damage increases gradually with temperature, but granite appears to suffer negative damage at 100 degrees C. Granite sample compression strength generally decreases with increasing temperature, while sandstone compression strength does not show obvious change between room temperature and 800 degrees C, but begins to decline rapidly above 800 degrees C. Peak strain increases with temperature and the increase rate of granite is similar to that of sandstone. Elastic modulus decreases with increasing temperature and decline rate of granite is much greater than sandstone. In addition, the temperature effect on the physical properties is much more intense than the effect on the mechanical properties of these two rock types.
- 出版日期2015-2-5
- 单位西北工业大学; 中国人民解放军空军工程大学
